Show all stored images found for movies and TV

[cracksloth 28]

I would like to use the MB3 web client to manage the images I have stored for movies and TV. Currently, the list only contains those images being used by MB3. Please consider adding a separate image group to the end of the image edit page called "other" that contains images not being used by MB3 but were still found in the movie folder or relevant TV folder. Examples of such files would include extrathumbs created by XBMC and redundant files such as a moviename-fanart.jpg file that isn't being utilized because a fanart.jpg also exists. This would be useful for users that have switched to MB3 from other media managers or just anyone who is planning on using MB3 to manage artwork.