[VSH] Add anti-AFK measures of any sort

[wishindo]

We need something to deal with any person going AFK without going into spectate mode prior to leaving their keyboard. One particularly egregious example I saw was someone being AFK across around 5 map changes in a row (at least two and a half hours, maybe longer, that's only when I left). The only saving grace was that you have to manually join a team in this mode so they were stuck in spectate, but before the first map change he was AFK on RED team for most of the map.

Example using server console settings (values provided are my recommendation):

mp_idlemaxtime "8"
mp_idledealmethod "1"

• Provide `mp_idlemaxtime` with the number of minutes one can be AFK acceptably. Note it does not care about idling while alive versus idling while dead.
• Provide `mp_idledealmethod` with 1 to move idlers from RED team into spectate, and kicking them if their still idle in spectate. Provide 2 to kick without the grace period of being moved into spectate.

Do not set max idle time to less than seven, as that's the current maximum possible round length (up to four minutes from round start to the point opening, then three minutes from point opening to forced stalemate). If someone dies right out of the gate in a round that ends in a timer-induced stalemate, and is idle for the entire time they're dead, they risk being kicked with an idle time below seven minutes.