[CMAKE] Implement PCH builds with target_precompile_headers. CORE-16905
[COMDLG32_WINETEST] Sync with Wine Staging 3.17. CORE-15127
[COMDLG32_WINETEST] Sync with Wine Staging 3.9. CORE-14656
[COMDLG32_WINETEST] Sync with Wine Staging 3.3. CORE-14434
[COMDLG32_WINETEST] Add a PCH.
Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys.