If a player who has a backpack has a full inventory, but their backpack is not full, it will put the picked up item in their backpack.
Backpack live updating for picking up items (If they have the backpack opened and they pick up an item with a full backpack, it will show it appearing in the backpack).
Removed a previous debug message that I accidentally left in.
Added the config key 'DisabledWorlds' where you can define which worlds backpacks should be disabled for.
Made it so the backpacks config doesn't save every time you disable the backpacks plugin. So you can now just reload the server to reload the config.
