Implement Bitmap and Image using Image IO 

- Create Bitmaps with width, height and format
- Create Images and Bitmaps from Files - Still need to implement Streams
- Create Graphics contexts from Images and Bitmaps which allows the ability to use them as Graphics Contexts.
- Respect Width when creating Pen from Brush
- Implement the basic DrawImage methods.

Unfortunately still more work to do.

See examples MTBitmapTests and BitmapTests for examples.