Build CUETools binaries for release using CI

- Add script CUETools/collect_files.bat, which copies the required
  files (.exe, .dll, etc.) according to the CUETools folder structure
- Add GitHub action .github/workflows/release-windows.yml, which is
  triggered upon tags or manually
- Upload the folder including the built CUETools binaries as zip file
  using actions/upload-artifact@v2