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This reverts commit f8a8c0d8.

Also automatically unlock if device screenlock was removed.

This solution even works when "don't keep activities" is active

When the user removes the screen lock, the app does not get really
locked. There is no way about getting notified about this. Before users
lock the app without it getting actually locked, we rather remove the
button that was collapsed and not easy to find anyway.

This only shows the settings if a screen lock is available.
If the setting is activated, it shows a drawer item for locking.
Once locked, the screen lock secret needs to be entered to enter the
app again.

First part of #1247

This gets rid of all those pesky 9-Patch drawables

Move SignIn reminder code into AndroidNotificationManager and don't show reminder once PasswordActivity was opened

This fixes an issue where the build type values were overriding the
flavor values.