[Commands] Convert NPC Spawn Methods to Repositories (#3956)

* [Commands] Convert NPC Spawn Methods to Repositories

# Notes
- Convert `AddNewNPCSpawnGroupCommand()`, `AddNPCTypes()`, `AddSpawnFromSpawnGroup()`, `CreateNewNPCCommand()`, `DeleteSpawnLeaveInNPCTypeTable()`, `DeleteSpawnRemoveFromNPCTypeTable()`, `NPCSpawnDB()`, and `UpdateNPCTypeAppearance()`.

* Regenerate.

* Cleanup.

common/repositories/base/base_spawngroup_repository.h

@@ -16,6 +16,7 @@
 #include "../../strings.h"
 #include <ctime>
 
+
 class BaseSpawngroupRepository {
 public:
 	struct Spawngroup {