Added 1.15 support!
Added a command to create custom command in-game:
/customcommand.
Added number support for gamemodes. The [gamemode] action and {gamemode} placeholder now support the number 0, 1, 2 and 3 for gamemodes.
Recoded the custom signs system. It wasn't working as it should. It now supports per-player placeholders (and general ones) using PAPI.
Fixed the [target] action. We made some faults in our code which caused it to not target the specified player, but instead throw an error.