`--pretty` style errors should be the default on supported TTYs

[weswigham]

Title. It would be nice to add a --errorStyle [pretty|terse|auto] command and deprecate --pretty (which would then be equivalent to --errorStyle pretty) as well.

cc @DanielRosenwasser

[DanielRosenwasser]

👍

[DanielRosenwasser]

For the record, terse needs to be the default when output to

• a file
• a pipe
• anything else that's not console output?