util.py: added function `create_enum`
transient.py: pop: correct handling of `None` value for `close_msg`
command.py: added `find_current_package_dir` so set-load is optional
new module "chimi.dependency": handles installation of Chimi dependencies

This is achieved through integration with `chimi.transient.import_`, which
happens to be used when including most external Chimi dependencies anyway.
command.py: add missing newline to error output for options parse failure
util.py: Table: add support for entries with multiple lines
{settings,transient}.py: allow to disable auto-install of script deps