convert_eai_u2w should map from unix to windows, not the other way
round (spotted by Dominic Wise).

It is allowed to copy a SAFEARRAY with a NULL pvData, as long as
cbElements is non-zero. Add a test for this and fix the safe array
code.

CreateErrorInfo isn't a stub so don't print this in the trace
message.

Add const attributes to parameters for several functions and fix up
some formatting.

OleTranslateColor isn't a stub so don't print ":stub" in the trace
message.

Don't dereference a possible NULL pointer.

Also use the specified access rights in the open_token request.

Always release nsIWebBrowserSetup.

Start to add support for DirectX 8 vertex shaders, constants and
registers are now correctly assigned and loaded allowing support for
most basic d3d8 shaders.

The BytesRead parameter passed to ReadFile may never be NULL.