Minor fixes.

Small fixes.

- support string sent in by address, rather then index
- add FIXMEs for multiple image lists
- protect agains inexistent buttons
- call up to the DefWindowProc when erasing bkgnd when appropriate

mickey/pixel ratio).

- Recalculate the prefix location if ellipsification alters it.  This
  carefully does NOT emulate a Microsoft bug in which reprefixing is
  wrong when the first character removed by ellipsification is the one
  that would have been underlined (under Win98 at least).

Implemented CheckTokenMembership and GetAce.

- always use the dlg cntrl ID of the sender

Added stubs for CheckEscapes[AW] and ExtractAssociatedIconExW.

- pass the infoPtr around instead of the hwnd
- use W-functions instead of A-functions
- more checks in case of failures
- make indentation and style consistent throughout the file

Property sheet Unicodification.
Support additional wizard flags.

return the primary lang else we return 0.