arti-config: Move cmdline to tor-config

This does not know anything about arti, only about TOML and Config.

Code motion, plus necessary import adjustments.

This is part of abolishing arti-config, which is part of #456 (closed).

assigned to @Diziet

requested review from @eta

added 9 commits

• 0a42d8d5...b137be22 - 8 commits from branch tpo/core:main
• ab3bd9d6 - arti-config: Move cmdline to tor-config

Compare with previous version

Rebased to fix the trivial conflict with one of my other MRs.

approved this merge request

merged

mentioned in commit 5990df53