tests
- add ConvertStringSidToSidA
- add missing exports for ConvertStringSidToSidA/W

colour mapping associated with a dib section - it's this table that
GetDIBColorTable should retrieve.
Added some GetDIBColorTable tests.

  button; use plain mouse capture instead like native.
- Return only HTTRANSPARENT/HTCLIENT from WM_NCHITTEST and remove
  associated hacks of WM_SETCURSOR, WM_NCLBUTTONDOWN and
  WM_NCLBUTTONUP.
- Refactor state change code so that state changes don't happen as
  side effects from messages such as WM_NCCALCSIZE, instead only from
  user input messages like WM_MOUSEMOVE.

going to be deleted should work.

CSP in CryptAcquireContextA.

Stub out a bit more of EndUpdateResource.

- Order available buttons in the same way as the native version.

- WM_SETCURSOR does not need to be handled as it is not sent whilst
  the window is captured.
- Make uDragListMessage non-static so that we can re-use it
  elsewhere.

Make WS2_send(), WS_getsockopt(), and WS_setsockopt() IPX support work
on FreeBSD.

spurious errors later on.