Add button over the map to allow switching map types
remove unused methods from FuncTools.cs
Merge branch 'unstable' into DA-411

* unstable:
  Avoid touching pager's fragments programmatically to avoid exception related to a bug in ChildFragmentManager; make MainNavigationActivity "SingleTop"
  improved sync so that some events (for example a drallo becomes successful) force a sync, while others can be throttled by the throttling controller.

Conflicts:
	DralloAndroid/DralloAndroid.csproj
try to make map type switching button look like Google's buttons on the map
set initial zoom on Android
Merge branch 'DA-410' into unstable

* DA-410:
  set initial zoom on Android
  try to make map type switching button look like Google's buttons on the map
  remove unused methods from FuncTools.cs
  Add button over the map to allow switching map types