This MR separates comctl32 into v5 and v6. A full branch is at https://gitlab.winehq.org/zhiyi/wine/-/commits/comctl32-separation. The remaining commits are to remove items that shouldn't be in v5. comctl32-version_6 in wine-staging can be dropped after this MR.
-- v4: comctl32: Separate v5 and v6. comctl32/tests: Add version tests. user32: Load version for comctl32 v6 window classes. comctl32/tests: Fix a window leak.