update to Android API 35

• update gradle
• update dependencies
• upgrade to API 35
• adapt UI to API 35 requirements: increase height of action bar, so that it draws below the status bar, status bar icon color depends on underlying background color of action bar. Improve navigation drawer gesture handling by excluding 200 dp next to the status image (mask) from Android's back gesture recognition

more about the Android style guides regarding the action bar and status bar: https://developer.android.com/design/ui/mobile/guides/foundations/system-bars#set-status