Convert arc feature to use PhutilConsoleTable.

Summary: Fixes T5110. PhutilConsoleTable handles Unicode characters and can display a decent-looking table.

Test Plan:

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T5110

Differential Revision: https://secure.phabricator.com/D9602