[NF] corpse.obj.Database Class Update
 - corpse.obj.Database class has been updated.
   - appendText method has been added.
   - removeText method has been added.
   - appendToken method has been added.
   - removeToken method has been added.
   - appendTag method has been added.
   - removeTag method has been added.
 - Some bugs have been fixed.
IMPORTANT: Commit has NF. appendText method shows error. It will be fixed soon.