Spotted by Andrew Talbot.

Also corrects some related comments.

Based on a patch by Maarten Lankhorst.

d3d8: Use the wined3d declaration to retrieve the d3d8 shader in IDirect3DDevice8Impl_GetVertexShader().

This makes it no longer necessary to create a wined3d vertex shader
when the d3d8 vertex shader has a NULL function.

There is no reason for the rich text format parser to need a handle to
the window, and even if there were it has a handle to the editor which
contains a handle to the window.  It is better to remove this
considering we need to cut down on the use of window handles to
implement windowless richedit controls.