Working on tags list
Tag remove from list
Tag existence check on scan
ACRA library
RootTools library and unlock method activation error check
NFC state check and unlock methods factory
NFC check completed
Stable unlock method preference change and Settings activity rebuilt
Preferences up navigation, support API <10, about page
Activity result method for admin privileges request
About page completed. Layout fix
Code cleanup
Message if empty tags list, small refactoring
Updated README and app icon
Small fixes in README
Removed unused permissions, new icon