comctl32: implement TCM_REMOVEIMAGE (try2)

[Vitaliy Margolen]

Nikolay Sivov wrote:
> Changelog:
>    - try2: fix for several items with a same image case
>    - implement TCM_REMOVEIMAGE

What about this comment from msdn?

---------
The tab control updates each tab's image index, so each tab remains
associated with the same image as before. If a tab is using the image being
removed, the tab will be set to have no image.
---------

It implies that indexes should be adjusted if you remove an image somewhere
at the front or middle of the image list. Don't see you doing this in your
patch.

Vitaliy.