Changes proposed in this pull request:
1. Clarified instructions how to build Marian on Windows in `vs/README.md`.
2. `vs/CheckOrInstallDeps.bat` does not stop if CUDA or MKL are not installed.
This PR updates Windows build using Visual Studio CMake compilation with Ninja. It does not affect standard VS compilation or Windows builds on Azure/GitHub CI.
List of changes:
- Fixed syntax in the script installing dependencies via vcpkg.
- Removed installation of Protobuf (already included as a submodule) and Boost 1.72 (the previous solution no longer works with new vcpkg).
- Disabled compilation of marian-server in the default setting due to Boost issues.
- Disabled compilation of NCCL in the default setting due to an error (see comment in the code).
- Updated vs/README.
