Move rate limiting / queued packet sending logic from Com_Frame() to sv_main.c

code/qcommon/qcommon.h

@@ -1039,8 +1039,7 @@ void SV_Frame( int msec );
 void SV_PacketEvent( netadr_t from, msg_t *msg );
 int SV_FrameMsec(void);
 qboolean SV_GameCommand( void );
-int SV_SendDownloadMessages(void);
-int SV_SendQueuedMessages(void);
+int SV_SendQueuedPackets(void);
 
 //
 // UI interface