mshtml: Implement Cycle Collection for all mshtml objects (dispex), part 4.
The first few patches will introduce temporary leaks or cyclic refs, but that's because we'll handle them properly with the dispex CC, and the last patch should fix this. Other objects' traversal will follow in another MR.
EDIT: This now does more prep work and converts nodes to use the dispex CC, using temporary helpers, without any other object or temporary leaks yet.
Edited by Gabriel Ivăncescu