Fix 2 minor bugs in CA:

#1 join the game, kill yourself, spectate with F3, join next round and you'll see gibs coming out from the spectator camera point of view
#2 join the game, spectate with F3, join next round and you'll see the error "Obituary called on non-player?!" in the console
CA: Fix spectate command (F3) not working well if used when the player is spectator but still in game (listed as player in the scoreboard) (player is dead and presses SPACE (join command)); in this case F3 didn't make him a real spectator as it should.
Bots that connect when a round is already started stay spectators until next round
Also count players scheduled to join the next round when deciding whether server reached maximum number of active players (g_maxplayers)
When a CA player is spectating but still in game, on command join don't even try to check if join is allowed
At last, I hope, fix right click causing to join the game when you're spectating (being out of the game) someone, instead of becoming observer
Specify default number of teams for CA
Make declarations of g_ca_point_limit and g_ca_point_leadlimit consistent with the other analogous cvars
Remove periods from 2 cvar descriptions
CA: properly detect real spectator when spectators are not allowed (nospectators command) and make real spectators when calling allspec and "moveplayer spec"
CA: ignore respawn settings (delay, forced respawn) as dead players can't respawn anyway.
Merge branch 'master' into terencehill/ca_fixes
Merge branch 'master' into terencehill/ca_fixes

Conflicts:
	qcsrc/server/cl_player.qc
Apply commit 9f2347b8dc on the updated master: CA: ignore respawn settings (delay, forced respawn) as dead players can't respawn anyway.
allowed_to_spawn isn't used by invasion code, remove its initialization
CA and Freezetag: implement more robust code to detect teams that need players. It also helps to reduce missing_teams notification arguments from 4 to 1.
Hide missing_team notification if there's nobody playing, it's pointless
CA and Freezetag: centerprint "^F4You are now alone!" to the last alive player of the team
Merge branch 'master' into terencehill/ca_fixes
Migrate remaining CA messages to the notification system