2.0 - Setting config values via shell meta commands

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Two things:

1. it doesn't seem like i can set all configurations in the shell. The readme mentions edit-mode and terminator-required which made me think I might be able to set other things in the config. It looks like I cannot set other things, e.g., \set auto-commit true does not work
2. the config has underscores and the shell \set uses dashes. could we update this to be consistent? when i run \env i get underscores, but the \set command wants dashes