* #include an absolute path didn't work - because paths were taken to always be relative.

* First integration of slang-pack.

* Use .os

* Add optional dependency support.

* Update github actions/scripts to update deps. aarch64 needs special handling.

* Upgrade to latest slang-pack for ignore-deps support.

* Fix linux build issues.

* Copying slang-llvm from dependencies.

* Add support for LLVM for host callable.
Added CodeGenTransitionMap.

* Remove hack to enable host callable for LLVM.

* Small improvements around transitions/downstream compiler.

* Fix typo in method name.

* Fix comment.

* Update visual studio project.

* Updage slang-llvm to include initialization fix.

* Fix handling extraction of clang version number.

* Fix some formatting problems.

* hack - to see if there is a version problem on CI.

* Remove progress on github action linux.

* Allow version lines to have text before 'prefix'.

* Update slang-binaries to include centos-7 premake binaries.

* Upgrade slang-binaries.

* Upgrade slang-binaries.

* Update slang binaries to have certificates.

* Fix handling of dependency path.

* Update README to include LLVM
Update building to include --deps and --arch

* Include slang-llvm in packages.

* Update building docs.