Cleaned up the mapflag system (#2943)

* Created setter and getter functions.
* Adjusted all calls to use these functions.
* Converted mapflags to C++ map container.
* Converted drop_list to vector.
* Converted skill_damage ERS into vector and increased limit from UINT8 to UINT16.
* Cleaned up several functions to be more dynamic to reduce redundancy that was all over the place.
* Renamed nosumstarmiracle to nosunmoonstarmiracle.
* Adjusted skill_damage mapflag to use proper defined constants.
* Refactored map index into a vector.
Thanks to @Lemongrass3110 for a lot of help and @secretdataz!

src/map/trade.cpp

@@ -32,7 +32,7 @@ void trade_traderequest(struct map_session_data *sd, struct map_session_data *ta
 {
 	nullpo_retv(sd);
 
-	if (map[sd->bl.m].flag.notrade) {
+	if (map_getmapflag(sd->bl.m, MF_NOTRADE)) {
 		clif_displaymessage (sd->fd, msg_txt(sd,272));
 		return; //Can't trade in notrade mapflag maps.
 	}