- 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/common.c

@@ -3585,3 +3585,33 @@ void Com_RandomBytes( byte *string, int len )
 		string[i] = (unsigned char)( rand() % 255 );
 }
 
+
+/*
+==================
+Com_IsVoipTarget
+
+Returns non-zero if given clientNum is enabled in voipTargets, zero otherwise.
+If clientNum is negative return if any bit is set.
+==================
+*/
+qboolean Com_IsVoipTarget(uint8_t *voipTargets, int voipTargetsSize, int clientNum)
+{
+	int index;
+	if(clientNum < 0)
+	{
+		for(index = 0; index < voipTargetsSize; index++)
+		{
+			if(voipTargets[index])
+				return qtrue;
+		}
+		
+		return qfalse;
+	}
+
+	index = clientNum >> 3;
+	
+	if(index < voipTargetsSize)
+		return (voipTargets[index] & (1 << (clientNum & 0x07)));
+
+	return qfalse;
+}