Muzei Saver

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* Added ability to choose where to save the image instead of always using the "Downloads" directory.
* Added Quick Settings tile and the ability to remove the launcher icon if the tile is enabled.
* Image is now saved using a service so the device remains responsive.
* No longer requires read/write external storage permissions.
* Now requires Android 5.0+ (Lollipop/API 21) and Muzei 3.0.2+