Function SV_Send

================= SV_Send Sends the contents of sv.multicast to a subset of the clients, then clears sv.multicast. MSG_ONE send to one client (ent can't be NULL) MSG_ALL same as broadcast (origin can be NULL) MSG_PVS send to clients potentially visible from org MSG_PHS send to clients potentially hearable from org if excludeSource is true, ent can't be NULL, dest should not be MSG_ONE =========