Converted elemental_db to YAML (#6102)

* Converts the Elemental Summons Tables file into YAML.
* Includes CSV2YAML converter.

Thanks to @Lemongrass3110, @aleos89, @secretdataz !

src/map/map.cpp

@@ -2249,7 +2249,7 @@ struct pet_data* map_id2pd(int id){
 	return BL_CAST(BL_PET, bl);
 }
 
-struct elemental_data* map_id2ed(int id) {
+struct s_elemental_data* map_id2ed(int id) {
 	struct block_list* bl = map_id2bl(id);
 	return BL_CAST(BL_ELEM, bl);
 }