Improve c++ modules support

[waruqi]

• [x] Refactor modules support
  • https://github.com/xmake-io/xmake/pull/4673
• [x] Support clang libc++/modules
  • https://github.com/llvm/llvm-project/pull/75741
• [x] Improve cmake generator
  • https://github.com/xmake-io/xmake/pull/4625
  • https://github.com/xmake-io/xmake/issues/4087
  • https://github.com/xmake-io/xmake/issues/3642
  • https://github.com/xmake-io/xmake/pull/4746
• [x] Improve compile_commands generator
  • https://github.com/xmake-io/xmake/issues/4330
• [x] Improve vs/vsxmake generator
  • https://github.com/xmake-io/xmake/issues/3426
• [x] Improve to install c++ modules for packages
• [x] Switch libc++/libstdc++/ runtimes
  • https://github.com/xmake-io/xmake/issues/4477
• [ ] Solve c++ modules rules and other rules conflict (protobuf rule, ..)
  • https://github.com/xmake-io/xmake/issues/3420

[Arthapz]

I got some time to continue the work on modules now, so i'll resume the work on https://github.com/xmake-io/xmake/pull/4321 , refactor the commits first to separate tests and refactoring as suggested

Next i'll look on https://github.com/llvm/llvm-project/pull/75741 and https://github.com/xmake-io/xmake/issues/4477

[waruqi]

Thanks, I am working at https://github.com/xmake-io/xmake/issues/4477 now.