sane.ds: Add fixmes for the last 2 unsupported capabilities; this now makes the code have fixmes for all known issues.

sane.ds: Remove large chunks of stubbed optional functionality; if it's optional, we don't have to support it, and it is not a stub.

EM_SETCHARFORMAT can be used to make text links.  Automatic URL
detection being enable would cause these links to be removed if the text
is not a URL, so this must be prevented.

Previously checks were made for AutoURLDetect_bEnable before calling
ME_UpdateSelectionLinkAttribute, or ME_UpdateLinkAttribute.  This is
more error prone than checking for this within the function, so one call
was missing this check.

ME_SetCursor also didn't respect this behaviour, since it wouldn't set
the cursor to the hand when hovering over a link without automatic URL
detection disabled.

Move to using type_basic_get_type in other files where appropriate.

widl: Fix a memory leak in the server/stub code when unmarshalling pointers to strings at the top level.

It is necessary for the first pointer to have an offset to a second
pointer instead of directly to the string type, since the second
pointer frees the memory for the string.

Avoid changing the details of a pointer once created.
Properly determine the pointer type for arrays.

Previously the richedit control contents were scrolled directly using
ScrollWindow.  This caused the richedit control to not actually scroll,
but only look like it scrolled, therefore causing plenty of glitches.