Added 1.16.1 support!
Added permission for coloring signs: additions.colorsigns
Added permission for coloring anvil items: additions.coloranvils
Fixed problems regarding creating custom menus on 1.13+
Fixed the in-game custom menu generator on 1.15 servers
Updated the XMaterial library to the latest version to support 1.14, 1.15, and 1.16 items.