Keep checking if we are whitelisted and request it if not

This can help to prevent non-determinism introduced by the crunching
process.

More information:
https://gitlab.com/fdroid/fdroid-website/commit/e48f9f0773568d92ff764ad3cc79eed0ae2c497e

With enabled and disabled crunching,
the size of the signed release APK was 17809681 bytes.

Related to #164

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

When the user enters a private conversation after adding her second
contact, an onboarding screen will be shown highlighting the possibility
of introducing the contacts to each other.

Add functionality to save and restore recently used Emojis

Update emoji and add new categories based on AOSP's XML file