Handle callstack resolution if DIA isn't registered
Handle callstack resolution if DIA isn't registered

* We can load up the msdia140.dll manually and initialise it that way even if
  it's not registered properly. That does mean we need to locate the DLL on our
  own though - we try in PATH and in a few default paths, and otherwise prompt
  the user for it (and save the path in our config).

googlestadia/renderdoc,Zorro666/renderdoc,TurtleRockStudios/renderdoc_public,baldurk/renderdoc,TurtleRockStudios/renderdoc_public,Zorro666/renderdoc,TurtleRockStudios/renderdoc_public,Zorro666/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,baldurk/renderdoc,googlestadia/renderdoc,googlestadia/renderdoc,TurtleRockStudios/renderdoc_public,TurtleRockStudios/renderdoc_public,googlestadia/renderdoc,baldurk/renderdoc,googlestadia/renderdoc,googlestadia/renderdoc,TurtleRockStudios/renderdoc_public,baldurk/renderdoc