Broken: cannot find net.i2p.i2ptunnel.I2PTunnel
(but it can when launching the router)

The navigation drawer has been (mostly) migrated to link to Activities instead
of Fragments. Only Activities can be searched via the inbuild Android search
function, which uses Intents.

- Migrated I2PActivityBase and subclasses to Fragment
- Added new MainActivity with navigation drawer to handle Fragments
- Added MainFragment to navigation drawer

Code compiles, installs and runs. Known bugs created:
- Some buttons now fail (can't use an Intent with a Fragment)
  -> Migrate usage of Intents to Fragment transactions
- New install/upgrade dialogs are commented out
  -> Migrate old Dialogs to DialogFragments

Added AddressbookSettingsActivity, and a link via settings. It's now possible to update subscriptions.txt on android.

- Split out WebViewClient to own class
- Clean up status a little
- Check for new install or new version at startup
- Popup dialog on new install or version
- Only merge config files on new version
- Add release notes and licenses screens

Next step: Update the scripts and docs to point to
../i2p.i2p/ for everything.

  - Move the classes around
  - Split into Activity and Service
  - Add status bar notification
  - More config changes