- Make a derivative MediaManagerItem class for generic folder support
- Make add and choose folder dialogs based on image plugin dialogs
- Implement folder and item mixins to get db models "for free"
- Implement database layer for media plugin
- Implement database layer for presentations plugins
- Refactor media plugin to inherit from FolderLibraryItem
- Refactor presentations plugin to inherit from FolderLibraryItem
- Migrate media files from settings to database
- Migrate presentations files from settings to database
- Convert the load icons in the media plugin into a dropdown
- Add new tests for MediaMediaItem.get_list()
- Closes#165
- Closes#223
- Closes#224
- Closes#582
