(DwqFormat): implemented BMP+MASK format.
(DwqFormat): implemented BMP+MASK format.

read BMP images manually as they're not really BMPs suitable for
BmpBitmapDecoder.

dsp2003/GARbro,dsp2003/GARbro,dsp2003/GARbro,morkt/GARbro,morkt/GARbro