Implement Drag List Control

[Robert Shearman]

Hi,

This patch adds full support for drag list common controls. There are no
known bugs, so as far as I am concerned this is 100% complete compared
to ComCtl32 v5.81 and probably v6.0 too.
This patch also adds a new cursor, the copy cursor which is a normal
cursor (copied from user32) with a + sign next to it. This is needed as
the user can request the control to display this during dragging.
I have also fixed the tabs in LBItemFromPt. Don't mix tabs and spaces!
</rant>

Rob

Changelog:
- Implement the drag list control
- Fix tabs in LBItemFromPt

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