android-api: Removed security API from DTNClient

The security API is now available using the classes Services and SecurityUtils.
android-daemon: Implement new security API
Whisper: Integration of new security API
Whisper: New indicators for signed / encrypted
daemon: Add endpoint to NativeKeyInfo
android-daemon: Strip application part from endpoint when opening key info
android-daemon: Add endpoint to key-info bundle
Whisper: Add extra padding to indicator icons