- implemented correct lookup when SymFindFileInPath is called to find
  a PDB file
- added pdb_fetch_file_info to gather relevant information
- when looking for a PDB file (from a .EXE or a .DLL), now using
  SymFindFileInPath to locate the PDB file with the correct
  information

First, native dbghelp doesn't do it, and it crashed windbg, likely
because we got the undocumented arguments wrong.

- implemented SymInitializeW (and made SymInitialize call it)
- implemented Sym{SG}etSearchPathW (and made Sym{SG}etSearchPath
  call them)
- per process search path is now stored as unicode string

Share shader_dump_ins_modifiers(), and make vertex shaders use it.
The saturate modifer (_sat) is valid on vs_3_0+, and it isn't being
shown in the trace.

Volume is only valid when sound card has volume support.

Fix parsing of 'long int'.
Simplify handling of spaces in a couple of regular expressions.

the buffer in the MIDL_STUB_MESSAGE in the inner pointer
marshalling/unmarshalling routines as these can be used for embedded
pointers, which handle the allocating or finding of the buffer
themselves. Do the incrementing in the outer
NdrPointerMarshall/Unmarshall/BufferSize routines instead.