New features
    - add note ciphering
    - add "Match word" Option in Search Functionality
    - increase minimal api to 26 (Android 8.0)
    - add monochrome icon
    - add zip archive export with password protection possible
    - add pref to disable timestamped folder for note export as text
    - add preferences for text padding in edit mode (#55)
    - add pref for bg and action bar color

Fix
    - remove underline note title in the New Interface (#53)

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