Replaced Farseer physics project.
It's now possible to move actors in the scene using a arrow widget.
Added more reversible commands.
Added a physics interface, instead of using farseer directly from the framework objects.
Moved some logic from the UI classes to the controllers.
Added missing .gitignore file.
Moved tool bar buttons style to window resources.
UI enhancements.
Added functionality to save model.
Added Puppeteer project for animation edition.
Style enhancements.