Even more proxy pruning

- Move the "world directory" getter out of the proxy - we can just use
   Forge's code here.
 - Remove the server proxies, as both were empty. We don't tend to
   register any dedicated-server specific code, so I think we can leave
   them out.

src/main/java/dan200/computercraft/ComputerCraft.java

@@ -71,6 +71,7 @@
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.IBlockAccess;
 import net.minecraft.world.World;
+import net.minecraftforge.common.DimensionManager;
 import net.minecraftforge.fml.common.FMLCommonHandler;
 import net.minecraftforge.fml.common.Mod;
 import net.minecraftforge.fml.common.SidedProxy;
@@ -236,11 +237,17 @@ public static class PocketUpgrades
     @Mod.Instance( value = ComputerCraft.MOD_ID )
     public static ComputerCraft instance;
 
-    @SidedProxy( clientSide = "dan200.computercraft.client.proxy.ComputerCraftProxyClient", serverSide = "dan200.computercraft.server.proxy.ComputerCraftProxyServer" )
-    public static IComputerCraftProxy proxy;
+    @SidedProxy(
+        clientSide = "dan200.computercraft.client.proxy.ComputerCraftProxyClient",
+        serverSide = "dan200.computercraft.shared.proxy.ComputerCraftProxyCommon"
+    )
+    private static IComputerCraftProxy proxy;
 
-    @SidedProxy( clientSide = "dan200.computercraft.client.proxy.CCTurtleProxyClient", serverSide = "dan200.computercraft.server.proxy.CCTurtleProxyServer" )
-    public static ICCTurtleProxy turtleProxy;
+    @SidedProxy(
+        clientSide = "dan200.computercraft.client.proxy.CCTurtleProxyClient",
+        serverSide = "dan200.computercraft.shared.proxy.CCTurtleProxyCommon"
+    )
+    private static ICCTurtleProxy turtleProxy;
 
     @Mod.EventHandler
     public void preInit( FMLPreInitializationEvent event )
@@ -359,11 +366,6 @@ private static File getResourcePackDir()
         return new File( getBaseDir(), "resourcepacks" );
     }
 
-    public static File getWorldDir( World world )
-    {
-        return proxy.getWorldDir( world );
-    }
-
     public static void sendToPlayer( EntityPlayer player, IMessage packet )
     {
         networkWrapper.sendTo( packet, (EntityPlayerMP) player );
@@ -460,7 +462,7 @@ public static IPacketNetwork getWirelessNetwork()
     @Deprecated
     public static int createUniqueNumberedSaveDir( World world, String parentSubPath )
     {
-        return IDAssigner.getNextIDFromDirectory( new File( getWorldDir( world ), parentSubPath ) );
+        return IDAssigner.getNextIDFromDirectory( parentSubPath );
     }
 
     @Deprecated
@@ -468,7 +470,7 @@ public static IWritableMount createSaveDirMount( World world, String subPath, lo
     {
         try
         {
-            return new FileMount( new File( getWorldDir( world ), subPath ), capacity );
+            return new FileMount( new File( getWorldDir(), subPath ), capacity );
         }
         catch( Exception e )
         {
@@ -688,7 +690,18 @@ public static void registerTurtleUpgrade( ITurtleUpgrade upgrade )
         dan200.computercraft.shared.TurtleUpgrades.register( upgrade );
     }
 
+    public static File getWorldDir()
+    {
+        return DimensionManager.getCurrentSaveRootDirectory();
+    }
+
     //region Compatibility
+    @Deprecated
+    public static File getWorldDir( World world )
+    {
+        return DimensionManager.getCurrentSaveRootDirectory();
+    }
+
     @Deprecated
     public static IMedia getMedia( ItemStack stack )
     {

src/main/java/dan200/computercraft/client/proxy/ComputerCraftProxyClient.java

@@ -83,12 +83,6 @@ public void init()
         ClientRegistry.bindTileEntitySpecialRenderer( TileCable.class, new TileEntityCableRenderer() );
     }
 
-    @Override
-    public File getWorldDir( World world )
-    {
-        return world.getSaveHandler().getWorldDirectory();
-    }
-
     @Override
     public void playRecordClient( BlockPos pos, SoundEvent record, String info )
     {

src/main/java/dan200/computercraft/server/proxy/CCTurtleProxyServer.java

@@ -1,13 +0,0 @@
-/*
- * This file is part of ComputerCraft - http://www.computercraft.info
- * Copyright Daniel Ratcliffe, 2011-2019. Do not distribute without permission.
- * Send enquiries to dratcliffe@gmail.com
- */
-
-package dan200.computercraft.server.proxy;
-
-import dan200.computercraft.shared.proxy.CCTurtleProxyCommon;
-
-public class CCTurtleProxyServer extends CCTurtleProxyCommon
-{
-}

src/main/java/dan200/computercraft/server/proxy/ComputerCraftProxyServer.java

@@ -1,22 +0,0 @@
-/*
- * This file is part of ComputerCraft - http://www.computercraft.info
- * Copyright Daniel Ratcliffe, 2011-2019. Do not distribute without permission.
- * Send enquiries to dratcliffe@gmail.com
- */
-
-package dan200.computercraft.server.proxy;
-
-import dan200.computercraft.shared.proxy.ComputerCraftProxyCommon;
-import net.minecraft.world.World;
-import net.minecraftforge.common.DimensionManager;
-
-import java.io.File;
-
-public class ComputerCraftProxyServer extends ComputerCraftProxyCommon
-{
-    @Override
-    public File getWorldDir( World world )
-    {
-        return DimensionManager.getWorld( 0 ).getSaveHandler().getWorldDirectory();
-    }
-}

src/main/java/dan200/computercraft/shared/peripheral/modem/wired/WiredModemLocalPeripheral.java

@@ -19,7 +19,6 @@
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
-import java.io.File;
 import java.util.Collections;
 import java.util.Map;
 
@@ -66,10 +65,7 @@ public boolean attach( @Nonnull World world, @Nonnull BlockPos origin, @Nonnull
             else if( id < 0 || !type.equals( this.type ) )
             {
                 this.type = type;
-                this.id = IDAssigner.getNextIDFromFile( new File(
-                    ComputerCraft.getWorldDir( world ),
-                    "computer/lastid_" + type + ".txt"
-                ) );
+                this.id = IDAssigner.getNextIDFromFile( "computer/lastid_" + type + ".txt" );
             }
 
             return oldPeripheral == null || !oldPeripheral.equals( peripheral );

src/main/java/dan200/computercraft/shared/proxy/CCTurtleProxyCommon.java

@@ -11,7 +11,7 @@
 import net.minecraft.util.ResourceLocation;
 import net.minecraftforge.fml.common.registry.EntityRegistry;
 
-public abstract class CCTurtleProxyCommon implements ICCTurtleProxy
+public class CCTurtleProxyCommon implements ICCTurtleProxy
 {
     @Override
     public void preInit()

src/main/java/dan200/computercraft/shared/proxy/ComputerCraftProxyCommon.java

@@ -63,7 +63,7 @@
 import net.minecraftforge.fml.relauncher.SideOnly;
 import pl.asie.charset.ModCharset;
 
-public abstract class ComputerCraftProxyCommon implements IComputerCraftProxy
+public class ComputerCraftProxyCommon implements IComputerCraftProxy
 {
     @Override
     public void preInit()

src/main/java/dan200/computercraft/shared/proxy/IComputerCraftProxy.java

@@ -10,9 +10,6 @@
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.util.SoundEvent;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.world.World;
-
-import java.io.File;
 
 public interface IComputerCraftProxy
 {
@@ -22,8 +19,6 @@ public interface IComputerCraftProxy
 
     void initServer( MinecraftServer server );
 
-    File getWorldDir( World world );
-
     default void playRecordClient( BlockPos pos, SoundEvent record, String info )
     {
     }

src/main/java/dan200/computercraft/shared/util/IDAssigner.java

@@ -17,6 +17,16 @@ private IDAssigner()
     {
     }
 
+    public static int getNextIDFromDirectory( String path )
+    {
+        return getNextIDFromDirectory( new File( ComputerCraft.getWorldDir(), path ) );
+    }
+
+    public static int getNextIDFromFile( String path )
+    {
+        return getNextIDFromFile( new File( ComputerCraft.getWorldDir(), path ) );
+    }
+
     public static int getNextIDFromDirectory( File dir )
     {
         return getNextID( dir, true );