List all packages in the fastverseSource:
Core packages are first fetched from a project-level configuration file (if found), else from a global configuration file (if found),
otherwise the standard set of core packages is returned. In addition, if
extensions = TRUE, any packages used to extend the fastverse for the current
session (fetched from
getOption("fastverse.extend")) are also returned.
TRUEappends the set of core packages with all packages found in
logical. Include the fastverse package in the list?