* Added a dropdown to video & audio settings
* Changes to ListHelper:
** Limits resolution when code requests the default video resolution
** Limits audio bitrate when code requests the default audio bitrate
** Removed some dead code and did some cleanup
** Make methods private/protected to help understand what was in use
** The code now chooses one format over an other using a simple raking system defined in array constants. I realized I needed to do this in order to choose the most efficient video stream. I did my best to evaluate the video and audio formats based on quality and efficiency. It's not an exact science.
** Made changes to the tests to support my changes
-Modified playback speed control to use quadratic sliders instead of linear.
-Modified number formatters in player helper to use double instead of float.
-Simplified slider behavior in playback parameter dialog.
-Fixed potential NPE in base local fragment.
- Import subscriptions from YouTube and SoundCloud (all services that the extractor support)
- Import/export a JSON representation of the subscriptions
- [Minor] Remove some javax annotations in favor of the one provided by the android support library
- Up to 4k with 60 fps
- Not every device can play in that resolution and bitrate
- Add option to hide these high resolution greater than 1080p (2k,4k) for not clutter the menus
- Add a default resolution for the popup, wil be used when opening in popup mode from another app
* Fix permission at some places
* Fix access problem for downloaded files with external player
* Store finished Downloads
* Remove binding to DownloadService just to download a file
* Javadoc
* Code improvements
