hangman command allow inputting more than one char at a time

[Joshix-1]

It's annoying to always have to input every char at once. This should fix this problem.

But maybe you want to implement it differently. You probably could avoid the mass editing this solution use, but that's there currently too.

[Aninoss]

I would prefer to keep it like it is, because it's not too rare that people forget that the game is currently active and then writing a normal message in the channel can instantly lead to a lost game depending on the implementation