Add an /heal command to heal all players

[MrTalon63]

As in the title, my suggestion is all about adding some type of command to manually heal one or all players during the game.

[titivermeesch]

Isn't this more like a command that should be included in an utility plugin, not in a core plugin? Otherwise you could start adding /ban, /kick,... as well and that seems a bit overkill.

[itoncek4]

@MrTalon63 you can use EssentialsX or other plugins

[macha-dev]

Isn't this more like a command that should be included in an utility plugin, not in a core plugin? Otherwise you could start adding /ban, /kick,... as well and that seems a bit overkill.

I think having a /heal command is a good QOL change.
Opened #102