*** Command: admin ***
Set/get user permission levels. A level of 0 is maximum permission,
users without an explicitly set permission have a permission level of 1000.
Usage:
admin add <name / entity id / steam id> <level> [displayname]
admin remove <name / entity id / steam id>
admin addgroup <steam id> <level regular> <level mods> [displayname]
admin removegroup <steam id>
admin list
To use the add/remove sub commands with a name or entity id the player has
to be online, the variant with steam id can be used for currently offline
users too.
Displayname can be used to put a descriptive name to the ban list in addition
to the user's SteamID. If used on an online user the player name is used by default.
When adding groups you set two permission levels: The 'regular' level applies to
normal members of the group, the 'mods' level applies to moderators / officers of
the group.