Various bugfixes by Tobias Kuehnhammer (#5270)

- A stupid bug where bots re-trigger jumppads if they fell onto it.
- A small "memset" bug concerning player animations.
- Reward sounds were never cleared and thus they are played on a map restart.
- Safer and more secure handling of disconnected clients and clients with 
  malformed or illegal info strings.
- first_gauntlet_hit.wav was not played (ops/ps) bug
- capturelimit not hit (from OAX)

code/game/g_cmds.c

@@ -1590,7 +1590,7 @@ void ClientCommand( int clientNum ) {
 	char	cmd[MAX_TOKEN_CHARS];
 
 	ent = g_entities + clientNum;
-	if ( !ent->client ) {
+	if (!ent->client || ent->client->pers.connected != CON_CONNECTED) {
 		return;		// not fully in game yet
 	}