- Apply parts of Ben Millwood's target bitfield patch (#3787)

- Fix Ryan's FIXME and have voip packet buffer on the server dynamically allocated via Z_Malloc and store pointers in a circular buffer
- Improve voip target parsing on top of Ben Millwood's patch
- Add new "spatial" target where speaker is spatialized in 3d space and can be heard by all clients in hearing range (s_alMaxDistance)
  (#4467)
- Decrease voip sound lengths from 240ms to 80ms per voip packet to mitigate udp packet loss and decrease latency
- Protocol version incremented to 71

code/qcommon/qcommon.h

@@ -252,7 +252,7 @@ PROTOCOL
 ==============================================================
 */
 
-#define	PROTOCOL_VERSION	70
+#define	PROTOCOL_VERSION	71
 #define PROTOCOL_LEGACY_VERSION	68
 // 1.31 - 67
 
@@ -834,6 +834,8 @@ int			Com_RealTime(qtime_t *qtime);
 qboolean	Com_SafeMode( void );
 void		Com_RunAndTimeServerPacket(netadr_t *evFrom, msg_t *buf);
 
+qboolean	Com_IsVoipTarget(uint8_t *voipTargets, int voipTargetsSize, int clientNum);
+
 void		Com_StartupVariable( const char *match );
 // checks for and removes command line "+set var arg" constructs
 // if match is NULL, all set commands will be executed, otherwise