PAPI Support

[bobhenl]

Is your feature request related to a problem? Please describe.
Hello, can you please add Placeholderapi support, so we can use placeholder like %chestsort_XXX% that will show the current state of specific short types? It's related to when you have your own settings GUI; you cannot show the state there.

Describe the solution you'd like
I'd like the placeholder to get replaced with yes/no depending on whether the player has enabled the current sorting type (from the /sort) command or not.