Remove possibility to wait after initialising sync.

Currently the feature of being able to wait until synchronisation has
finished is redundant. In the future might return it, if there is no
other way.
Reorg Android project.

Added better directory structure for Android project, which should
separate different items nicely and help keep things sane as the project
grows.
Fix compilation errors in ModelsViewAdapter.

Xamarin.Studio had failed to notify of obvious comiplation errors. Fixed
now and project compiles again.
Add Android application entrypoint.
Add SettingStore for Android.

SettingStore is used to store Android runtime settings. It also
implements the ISettingsStore (from Phoebe) interface explicitly,
meaning it provides a backend for storing Phoebe's settings as well.