A whole bunch of refomatting

- Remove redundant constructors and super calls
 - Standardise naming of texture fields
 - Always use postfix notations for loops
 - Cleanup several peripheral classes

src/main/java/dan200/computercraft/shared/command/UserLevel.java

@@ -0,0 +1,70 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2018. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
+package dan200.computercraft.shared.command;
+
+import dan200.computercraft.shared.command.framework.CommandContext;
+import net.minecraft.command.ICommandSender;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.server.MinecraftServer;
+
+/**
+ * The level a user must be at in order to execute a command.
+ */
+public enum UserLevel
+{
+    /**
+     * Only can be used by the owner of the server: namely the server console or the player in SSP.
+     */
+    OWNER,
+
+    /**
+     * Can only be used by ops.
+     */
+    OP,
+
+    /**
+     * Can be used by any op, or the player in SSP.
+     */
+    OWNER_OP,
+
+    /**
+     * Can be used by anyone.
+     */
+    ANYONE;
+
+    public int toLevel()
+    {
+        switch( this )
+        {
+            case OWNER:
+                return 4;
+            case OP:
+            case OWNER_OP:
+                return 2;
+            case ANYONE:
+            default:
+                return 0;
+        }
+    }
+
+    public boolean canExecute( CommandContext context )
+    {
+        if( this == ANYONE ) return true;
+
+        // We *always* allow level 0 stuff, even if the
+        MinecraftServer server = context.getServer();
+        ICommandSender sender = context.getSender();
+
+        if( server.isSinglePlayer() && sender instanceof EntityPlayerMP &&
+            ((EntityPlayerMP) sender).getGameProfile().getName().equalsIgnoreCase( server.getServerOwner() ) )
+        {
+            if( this == OWNER || this == OWNER_OP ) return true;
+        }
+
+        return sender.canUseCommand( toLevel(), context.getRootCommand() );
+    }
+}