Xamarin Android bugfixes

#109 Xamarin Android fix

#114 - Xamarin Android fix

Xamarin Common: A reboot to the favourites view will cause multiple event subscriptions. Stop this behaviour.

Xamarin Android: Favourites list updates when returned to.

Xamarin - Moving gitignore into xamarin dir

Xamarin Android: exposing application for a given context.

Xamarin Android: Trimming search text input.

Xamarin Android: Load more list row shows highlighted state.

Xamarin Android: Removing redundant layout calls