Reduces visibility of internal fields/methods

Reduces the visibility of all fields to private and create setters/getters
when necessary. Exceptions are fields with GuiSync as these need to be
public.

Reduces the visibility of internal methods to private/protected/default when possible.

src/main/java/appeng/client/texture/ExtraBlockTextures.java

@@ -88,7 +88,7 @@ public enum ExtraBlockTextures
 	BlockPaint2( "BlockPaint2" ), BlockPaint3( "BlockPaint3" );
 
 	private final String name;
-	public IAESprite IIcon;
+	private IAESprite IIcon;
 
 	ExtraBlockTextures( final String name )
 	{