gdiplus: add a drawing test for GdipFillRectangleI

[Vincent Povirk]

This is a very simple drawing test that I've created to establish a precedent for drawing tests in gdiplus.

Gdiplus currently has no tests that draw things and then check what was drawn. I've added some functions that should make this easy. It's important to get this right the first time so any feedback will be most appreciated.
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