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/items/contents/QuartzKnifeObj.java

@@ -26,7 +26,7 @@ import appeng.api.implementations.guiobjects.IGuiItemObject;
 public class QuartzKnifeObj implements IGuiItemObject
 {
 
-	final ItemStack is;
+	private final ItemStack is;
 
 	public QuartzKnifeObj( final ItemStack o )
 	{