Unify/cleanup max snapshot entities on client and server

code/qcommon/qcommon.h

@@ -133,6 +133,8 @@ NET
 
 #define	MAX_PACKET_USERCMDS		32		// max number of usercmd_t in a packet
 
+#define	MAX_SNAPSHOT_ENTITIES	256
+
 #define	PORT_ANY			-1
 
 #define	MAX_RELIABLE_COMMANDS	64			// max string commands buffered for restransmit