Bitmap::createFromFile cannot handle file with bpp==1

[ttnghia]

In file Source\Utils\Bitmap.cpp, line 97, the switch command does not handle bpp in case it equals to 1. Therefore, when loading some images I got error saying "Unknown bits-per-pixel".

[nbentyNV]

Known issue. D3D11 doesn't have 1bpp and no one required support for it so far.
It's a low priority bug, it will take time before we get to it.