In the W->A translation make sure we have characters to translate
before doing the WideCharToMultiByte with -1.

There is no need to offset the source rectangle in the reverse
direction before scrolling.

Redo how headers are handled, eliminating the concept of Standard
Headers and allow all headers to be added multiple times.
Allow querying of headers with an index to get the multiple headers.
Respect response vs request headers in HttpQueryInfo.
Add a number of tests to extensively test header adding and replacing.

Simply copy the DIB bits in that case.

Use the GC of the destination device in X11DRV_DIB_CopyDIBSection so
that the clipping region is taken into account.

Based on a patch by Eric Kohl.

- implement a helper to decode sequences of like types
- use helper functions wherever applicable when decoding
- correct "expected" vs. "got" usage in tests
- fix a few other small bugs

SetPixelShader.

Update cubetexture so that names constants instead of numeric
constants are used for the facetype and also add some additional
checks where facetype is passed as a parameter to the function.

Added support for opening devices directly with the server when they
don't correspond to a Unix file.