* Implement disk caching of album art
This includes a button to clear the cache in the settings, as
requested.
Closes#358
* Make the cache size defaults match
* Implement the review by jonaski
* Fix more problems with the PR
- Fix includes
- Use common regex (Song::kCoverRemoveDisc) for removing Disc/CD from album
- Remove Disc/CD from album when creating hash
- Make imobiledevice support compile
- Fix setting device on windows
- Use QStandardPaths
- Load settings in StatusView widget
- Update about
- Remove redundant code
- Temporary hide missing audiopanorama error as workaround for windows build
