gdiplus: implement CachedBitmap based on Image

[Vincent Povirk]

Our current implementation of CachedBitmap clones the image it is given and attempts to force that image to be a Bitmap. This is impossible (at least without doing something more complex). It actually leaks the cloned Image by putting it in a local variable whose value is never used, and the GpCachedBitmap ends up pointing to an invalid Image, causing a crash if it is drawn.

Since the only operations permitted for CachedBitmaps are "draw" and "delete", it doesn't much matter whether we really have a Bitmap (ideally, we'd have a gdi bitmap optimized for the given HDC). So just clone the Image and use it in the usual way.
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