This function converts an renv-based project to a blaseRtemplates project using the new cache structure. Specifically, it will take the following actions on the provided project:
delete the renv folder
delete the renv lock file
write a new .Rprofile which in turn will
create a new user_project directory. This will be the primary package library for the project. It will contain symlinks pointing to the newest versions of packages in the main cache.
write a new file listing the packages actively used by the project into a new "library_catalogs" directory
Usage
upgrade_bt(path, path_to_cache_root = Sys.getenv("BLASERTEMPLATES_CACHE_ROOT"))