Added converter to invert the standard BooleanToVisibilityConverter
Hide 'Setup' and 'Reset' when in settings
Start Game is close to being ready.
Cancel link works.
Setup properly updates game now.
GameBoard.cs
Add event OnOccupy
PositionViewModel.cs
Propagate occupy's to view model.
Ai moves fill board visually.
Cleaned up some events.
Reset button works.
Visually updates who's turn it is.