[WINESYNC] d3dx9_36: Implement ID3DXFontImpl_DrawText.

[WINESYNC] d3dx9_36: Implement ID3DXFontImpl_DrawText.

Changes by Sebastian Lackner <sebastian@fds-team.de>:
* Use pitch value for locked buffer instead of assuming that pitch = width * bytesperpixel
* Avoid one for loop to simplify code
* Ensure that DrawText doesn't dereference a NULL pointer when count != 0.

Changes by Christian Costa <titan.costa@gmail.com>
* Use dedicated variables for text width & height instead of reusing rect.right and rect.bottom
* Remove useless test in pixel conversion
* Remove left over 'partial stub' in fixme

Changes by Sebastian Lackner <sebastian@fds-team.de>:
* Replace code to convert text from ascii to widechar
* Strip terminating NULL chars before drawing text

wine-staging patch by Christian Costa <titan.costa@gmail.com>