/WHO [+|-][achmnsuCM] [args]
Flags are specified like channel modes,
The flags cghimnsu all have arguments
Flags are set to a positive check by +, a negative check by -
The flags work as follows:
Flag a: user is away
Flag c <channel>: user is on <channel>,
no wildcards accepted
Flag h <host>: user has string <host> in their hostname,
wildcards accepted
Flag m <usermodes>: user has <usermodes> set on them,
only usermodes o/O/a/A will return a result
Flag n <nick>: user has string <nick> in their nickname,
wildcards accepted
Flag s <server>: user is on server <server>,
wildcards not accepted
Flag u <user>: user has string <user> in their username,
wildcards accepted
Behavior flags:
Flag C: show first visible channel user is in
Flag M: check for user in channels I am a member of
