rpcrt4: Implement MesEncodeIncrementalHandleCreate, MesDecodeIncrementalHandleCreate, MesIncrementalHandleReset and MesHandleFree.

This creates an nvts version of this function, and removes the nvts
code from the original one. The nvts version is used by the nvts
pipeline implementation, the original one by the nvrc-only, atifs and
ffp one.

As long as we have the shader constants in misc, it is best to keep
all the code that affects shader constants, like bumpenvmat setting,
in there as well.

This code creates the structures and the pipeline selection, as well
as the caps filling. It does not yet move the actual code around,
since this will be a bigger task.

This should do the same as the existing code, but it is more obvious.

This is a further separation of the sampler state, and a preparation
to move the nv texture shader stuff to its own pipeline implementation.

When a sampler is changed and unconditional NP2 textures are not
supported, the texture matrix may need adjustment. The sampler state
function checks for that, and calls the texture transform setting
function in that case. However, samplers are a misc state, and the
texture transform flags a vertex state.  Thus split up the code and
move the matrix changes to the vertex side.

Since atifs is only doing the fragment pipeline replacement right now
there is no need for the shader backend structure any longer. The ffp
private data is stored in new fragment pipeline private data(which
could potentially be set to equal the shader private data if needed).