Add back several more methods for Plethora

While Plethora has been updated to no longer require these, it's
probably worth keeping them around a little longer, as people may not
upgrade them in sync.

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

@@ -63,4 +63,10 @@ public class DirectionUtil
                 return 0.0f;
         }
     }
+
+    @Deprecated
+    public static float toYawAngle( EnumFacing dir )
+    {
+        return dir.getHorizontalAngle();
+    }
 }

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

@@ -15,6 +15,12 @@ import net.minecraft.world.World;
 
 public class RedstoneUtil
 {
+    @Deprecated
+    public static int getRedstoneOutput( World world, BlockPos pos, EnumFacing side )
+    {
+        return world.getRedstonePower( pos, side );
+    }
+
     @Deprecated
     public static int getBundledRedstoneOutput( World world, BlockPos pos, EnumFacing side )
     {

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

@@ -25,8 +25,15 @@ import java.util.List;
 
 public class WorldUtil
 {
+    @SuppressWarnings( "Guava" )
     private static final Predicate<Entity> CAN_COLLIDE = x -> x != null && !x.isDead && x.canBeCollidedWith();
 
+    @Deprecated
+    public static boolean isBlockInWorld( World world, BlockPos pos )
+    {
+        return world.isValid( pos );
+    }
+
     public static boolean isLiquidBlock( World world, BlockPos pos )
     {
         return world.getBlockState( pos ).getMaterial().isLiquid();