Release master

Add first version of the MacOS script

though it didn't work because the dynlib was too big for GitHub

Fix deprecated API usage

For details see Deprecating set-env and add-path commands

Bug fix release

Cleaning of cache done on save

Initial release of Conan Cache Action

This initial release uses a GitHub repo (and possibly GitHub Large File Storage (LFS)) to cache the .conan directory for builds using Conan.