Fix various inventory issues by bumping InvMenu from v3.1.1^ -> v4.0.0^
Fix bug where stopping server fails to save loaded vaults and throws an error
Fix permission grouping bug resulting in incorrect permission checking
Update LICENSE to GNU LGPL v2.1
Added permission-grouping.yml. This helps cut down on the number of assigned permissions.
For example: if you wanted to give VIPs on your server access to 30 vaults, you no longer need to assign
them 30 permissions - a single permission can do.
Bump to v3.1.1
PlayerVaults now uses InvMenu v3.1.1 - GUI graphic is (kinda) hidden from the player as it's now spawned behind the player.
Use InvMenu v3.0.0, fix RuntimeError class not found
You should never use the /reload command, most pocketmine plugins aren't reload friendly and may cause issues with memory usage.
Besides, /reload is scheduled for removal in the next major PocketMine-MP release so I see no need for working on this issue, use /stop instead.