Synchronize Damage Feature (#8305)

- Added a new monster stat "ClientAttackMotion" to mob_db.yml which is the time from when a monster attacks until which the damage shows on the client at 1x speed
- Added a new config synchronize_damage; when set to "yes", the client will display the damage of normal monster attacks at the exact time it is applied on the server, removing position lag (fixes #259)

Special thanks to all people who worked together to make this possible.

Co-authored-by: aleos, Lemongrass3110, Atemo

src/map/mob.cpp

@@ -4461,6 +4461,7 @@ s_mob_db::s_mob_db()
 	status.speed = DEFAULT_WALK_SPEED;
 	status.adelay = cap_value(0, battle_config.monster_max_aspd * 2, 4000);
 	status.amotion = cap_value(0, battle_config.monster_max_aspd, 2000);
+	status.clientamotion = cap_value(status.amotion, 1, USHRT_MAX);
 	status.mode = static_cast<e_mode>(MONSTER_TYPE_06);
 
 	vd.class_ = id;
@@ -4884,6 +4885,18 @@ uint64 MobDatabase::parseBodyNode(const ryml::NodeRef& node) {
 		mob->status.amotion = cap_value(speed, battle_config.monster_max_aspd, 2000);
 	}
 
+	if (this->nodeExists(node, "ClientAttackMotion")) {
+		uint16 speed;
+
+		if (!this->asUInt16(node, "ClientAttackMotion", speed))
+			return 0;
+
+		mob->status.clientamotion = cap_value(speed, 1, USHRT_MAX);
+	} else {
+		if (!exists)
+			mob->status.clientamotion = cap_value(mob->status.amotion, 1, USHRT_MAX);
+	}
+
 	if (this->nodeExists(node, "DamageMotion")) {
 		uint16 speed;