Improve some column behaviors for Milestone/Subproject columns

Summary:
Ref T10010.

• Don't allow milestones to be reordered.
• Hide phantom subproject columns when reodrering.
• Don't allow subproject/milestone columns to be renamed.
• Force milestones to be ordered at the end, and in the correct order.
• Add some missing crumbs.

Test Plan: Reordered columns, renamed columns, made a new column, viewed column details.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10010

Differential Revision: https://secure.phabricator.com/D15183