Also lock/unlock the module only on creation/destruction of the object.

Tests every combination of display format and backbuffer format from
(D3DFMT_R5G6B5, D3DFMT_X1R5G5B5, D3DFMT_A1R5G5B5, D3DFMT_X8R8G8B8,
D3DFMT_A8R8G8B8, D3DFMT_A2R10G10B10, D3DFMT_UNKNOWN).

Tests the behavior of CheckDeviceType() with display formats for which there
are no adapter modes, rather than skipping those.

Tests windowed mode.

For windowed mode:
* It doesn't matter if there are no adapter modes for the display format.
* A backbuffer format is valid so long as there's support for color conversion
 to the display format.
* A backbuffer format of D3DFMT_UNKNOWN is allowed and means that it should be
 the same as the display format.

d3d9: Make CheckDeviceType() fail for display formats other than D3DFMT_X8R8G8B8 and D3DFMT_R5G6B5 in full-screen.

The adapter mode functions already enforce this, and tests show
CheckDeviceType() should fail for full-screen mode with display formats for
which there are no adapter modes.