Add module: jdamcd/android-crop, to crop image
Change UI, add wallpaper source selector button (no implement)
Disable lock screen paper selector when could not set lock screen paper
Set preference variable as class field
Add a wrap to listen default shared preference change event
Update wallpaper when toggle related checkbox.
Add method to get wallpaper size in class SetWallPaper
Rename class SetWallPaper to WallPaperUpdater
Enable user to set wallpaper's template when update.