Begin adding dataloaders for better performance with storing and
retrieving media files in the database.
Revert "Begin adding dataloaders for better performance with storing and retrieving media files in the database."

This reverts commit 8fd8141c89a2beed335def2e64b5b65f4d0d892c.
Data Loader
- Added Data Loader for Artist to load data as it is retrieved
- Added Data Source for Artist
- Added ContentChangeTask to handle the loading of new data
- Renamed package for each category of media to Dto
- Reorganized some package names