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/CellConfig.java

@@ -27,7 +27,7 @@ import appeng.util.Platform;
 public class CellConfig extends AppEngInternalInventory
 {
 
-	final ItemStack is;
+	private final ItemStack is;
 
 	public CellConfig( final ItemStack is )
 	{