Feature - Implement warden commands for Foxhole

[JensGryspeert]

Based on the following received description is this PR created.

Eh, who would be able to review the viability of adding a couple slash commands limited to a role.

I'd like to expand a bit on foxhole support -- I'd like to see if we could get a few /commands added to do three or four things

minimum
/warden add discordname --> add role 'Warden Verified' to user
/warden remove discordname --> remove role 'Warden Verified' from user
/warden purge --> remove all 'Warden Verified' role from all users

stretch
/warden bulkadd comma-separated discord names --> iterate through list, add role 'Warden Verified' to users

and have the use of these limited to either a Warden Admin role, that we'd likely manually assign.

[SyniRon]

Looks good other than the one requested change to remove hardcoded role permission. Great work!

[SyniRon]

LGTM