Add launcher icon for debug builds

[grote]

Note that release builds still won't have a launcher icon, because the functionality is embedded into the Settings app.

[theimpulson]

@grote is it possible for you to also add a Android Studio task to launch the debug builds on device like normal app instead of launching emulator?

[grote]

@grote is it possible for you to also add a Android Studio task to launch the debug builds on device like normal app instead of launching emulator?

Not sure I understand. I have an app run configuration that launches on normal device, if connected. I am not even using emulators myself.

[t-m-w]

Works! ./gradlew installDebug or adb install directed at the path work fine for the Seedvault app itself on userdebug build (unrelated contactsbackup signing config issues notwithstanding).