gdiplus: Support for indexed formats in GdipBitmapSetPixel

[MP]

I run one windows application (unfortunately the application is not publicly
available) and I run into some parts of the application being shown in black
and lots of "fixme:gdiplus:GdipBitmapSetPixel not implemented for format
0x30803" shown on console.

So I added support for indexed formats (PixelFormat1bppIndexed,
PixelFormat4bppIndexed, PixelFormat8bppIndexed) to GdipBitmapSetPixel.

Attaching patch to current git origin.

Martin Petricek
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