started impl of player
example files
Splitting boxes now works (r0ughly) Also Boxes now paint themselves
New Open Save works
added CloseCommand and SaveCommand
started impl for NewPartituraCommand and AddPagesCommand
removed IRuntimeInfo, GuiInfo.cs cleaned up todo's
new AutoFillCommand dont allow more than one box on same row
made CanExecute() non static
Initial version. Just allows to draw some boxes