HuskHomes

Add Paper Plugin support, Pl3xMap hook (#332)

This pull request adds experimental native Paper plugin support, allowing HuskHomes to leverage the various benefits that brings with it (native adventure support, paper plugin compatibility, runtime command registering, additional events etc). Installing HuskHomes on a Paper 1.19.4 will let you use this mode, which currently has two differences:

• The Paper plugin implementation supports Pl3xMap (v2) as a map hook, letting you display public homes & warps on your Pl3xMap (see below).
• Disabled commands won't register at all on the Paper implementation (no disabled command message will show; instead "unknown command" will always appear

No changes should be notable on non-paper platforms. This includes Paper <=1.19.3, which this doesn't support. Note this is subject to change as the Paper Plugin specification is still in development, and it's my intent to improve a few other things to make paper users' experiences even better down the road.