[Mono-osx] Graphics related changes

[Frank Krueger]

Hello, I have modified MonoMac in the following ways:

1. I moved NSAffineTransform to Foundation and added the important
functions. Previously it was in AppKit and lacked functions to actually
manipulate the matrix.

2. Changed the path to CoreGraphics lib. The previous path did not work. New
path suggested by Geoff Norton.

3. Changed NSGraphicsContext.GraphicsPort to return CGContext instead of
IntPtr. This seems to be the correct way to get a CGContext and it works
well.

Thanks,
-Frank
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