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/SlotInaccessible.java

@@ -27,7 +27,7 @@ import net.minecraft.item.ItemStack;
 public class SlotInaccessible extends AppEngSlot
 {
 
-	ItemStack dspStack = null;
+	private ItemStack dspStack = null;
 
 	public SlotInaccessible( final IInventory i, final int slotIdx, final int x, final int y )
 	{