Mirrored and rotated Blt() test

This test displays the DXGL logo using various combinations of flipping and 60 degree rotation, using combinations of DDBLTFX_MIRRORLEFTRIGHT, DDBLTFX_MIRRORUPDOWN, DDBLTFX_ROTATE90, DDBLTFX_ROTATE180, and DDBLTFX_ROTATE270.