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/container/slot/SlotFake.java

@@ -27,12 +27,9 @@ import net.minecraft.item.ItemStack;
 public class SlotFake extends AppEngSlot
 {
 
-	final int invSlot;
-
 	public SlotFake( final IInventory inv, final int idx, final int x, final int y )
 	{
 		super( inv, idx, x, y );
-		this.invSlot = idx;
 	}
 
 	@Override