DRTVWR-418: Rationalize LLPipeline API.

Someone evidently figured every static LLPipeline method should have at least
one void* parameter. There were methods requiring void* parameters that were
completely ignored.

More to the point, there were methods whose callers have a U32 in hand -- and
which want to use a U32 -- but which bizarrely forced callers to cast to void*
just so the method could cast back to U32. In a 64-bit compile, this isn't
merely pointless, it's erroneous. Change all such methods to accept U32;
remove (void*) casts from call sites.

While at it, fix LLPipeline API to use bool, true, false rather than their
obsolete all-caps predecessors. Once you eat that first potato chip... :-P