Implement player and weapon class restrictions

[krazykaze81]

A group of CVARs used to limit the number of each class on a team; default is -1 (no limit).

g_maxTeamLF
g_maxTeamMedic
g_maxTeamEngineer
g_tmaxTeamSoldier

This issue will also revamp the weapon restrictions to work the same as classes.

g_maxTeamPF
g_maxTeamSniper
g_maxTeamVenom
g_maxTeamFlamer

Current Weapon issue as follows:

RtCWpro 1.1 bug noticed 13/01/21: Accidentally went PF when I mashed my spawn binds and it allowed me to spawn PF even though our team already had one. Not seeing this in the open bugs list. Server it occurred on: connect hyperion-gaming.net:17700;password charizard

Joep was the other team's (Axis) PF, he killed me that spawn with it and he didn't change all round, so there were 3x PFs active in total in the game. Notice I actually pressed the correct class at seemingly the exact second I spawned. Maybe I accidentally tricked the weapon restriction by doing this at the last second? I doubt anyone will intentionally exploit it but if there’s any optimisations you can make to narrow the window further that’s not a bad thing.

Video
https://clips.twitch.tv/AntediluvianAnnoyingEyeballOSfrog