* Allow support for external contexts across multiple controls.
* Improve fix for event-ordering crash on some systems.
* Possible fix for event-ordering crash on some systems.
* Fix resize events not being raised.
* Moved namespace to OpenTK.Wpf.
* GLWpfControl now extends FrameworkElement instead of Control.
* Moved to pure-code solution for greater simplicity.
* Added some extra-paranoid null checking.
* Possible fix for NPE on renderer access.
* Automatically set the viewport for the user.
* Use own HWND for improved performance (Thanks to @Eschryn)
* Add time delta to the render event.
* Better handling of resizing via delayed updates.
* Remove slow-path detection (2x performance on low-end devices!)
* Fix duplicate OpenGL resource unloading.
* Add API to access the control's framebuffer.