Split Setup Issues into Groups

Summary: Groups setup issues into Important, PHP, MySQL, and Base for easier parsing on initial installations.

Test Plan:
Test my internal server and various issues.

{F289699}

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7207

Differential Revision: https://secure.phabricator.com/D11726