[ ] Update 'used' lists: lists of genres, tags, and kinds in the settings object. When a user adds a tag, for example, the tag is added to the list of used tags in the settings at the time of save. However, on startup we should recreate the list of tags (and genres and kinds) by scanning all the video objects in the library, particularly so that if any value isn't used anymore, it can be deleted from the 'used' list.
[x] Delete image files in temp folder
[ ] Update 'used' lists: lists of genres, tags, and kinds in the settings object. When a user adds a tag, for example, the tag is added to the list of used tags in the settings at the time of save. However, on startup we should recreate the list of tags (and genres and kinds) by scanning all the video objects in the library, particularly so that if any value isn't used anymore, it can be deleted from the 'used' list.