[CMAKE] Implement PCH builds with target_precompile_headers. CORE-16905
[WINDOWSCODECS_WINETEST] Sync with Wine Staging 4.18. CORE-16441
[WINETESTS] Supress GCC8 warnings
[WINDOWSCODECS_WINETEST] Sync with Wine Staging 4.0. CORE-15682
[WINDOWSCODECS_WINETEST] Sync with Wine Staging 3.3. CORE-14434
[WINDOWSCODECS_WINETEST] Add a PCH.
Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys.