WPF/Android: Updated ISyncView changes.
Android: Fixed bugs in MobileNavigationManager and in GraphicsContextWrapper.

- MobileNavigationManager: Fixed bug where the main activity would not
be shown when the resume playback info isn't available.
- GraphicsContextWrapper: Fixed bug where the text point of origin (x,y)
would be wrong depending on the font face. Text absolutely has to be
measured before drawing to make sure parts of the letter won't be out of
bounds.