New Gestures Feature

Just updated our system to the latest version, and the new gesture framework is great! Much better than the hack I was using before :)

Now that this is in place, it was trivially easy to let the user toggle between different manipulation modes without needing the keyboard.

Also set up something like the commonly-used DelegateCommand, to bind a delegate instead of a standard plot command:

Controller.BindKeyDown(OxyKey.Left, new OxyDelegateCommand<OxyKeyEventArgs>(a=>MoveTrackedItem(-1)));
Controller.BindKeyDown(OxyKey.Right, new OxyDelegateCommand<OxyKeyEventArgs>(a => MoveTrackedItem(+1)));

(Keeps the tracker visible, and moves it to the previous/next point in the current series)

No bug report here... Just paying my compliments to objo and Garreye. Looking great, guys.

Thanks for the feedback, it is great to hear that this refactorization was helpful!