[CMAKE] Replace custom functions to built-in ones add_target_compile_definitions -> target_compile_definitions add_target_compile_flags -> target_compile_options add_target_include_directories -> target_include_directories
[TOOLS] Fix/suppress all MSVC/x64 warnings (#1525)
Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys.