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This reverts commit f8a8c0d8.

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

This is just a first rough implementation.
A real UI designer should look over this.

Closes #1096

Closes #1288

Closes #1297

* Create at least one contact

When the user attempts an introduction, instead of the introduction
message input field, an explanatory text will be shown and the
introduction can not be made until the last one has been finished.

Signed-off-by: goapunk <noobie@goapunks.net>

Show a proper error message when database is too new or too old.

Keep checking if we are whitelisted and request it if not