Project revamp part 2: Edit

Summary:
Taking a pass at revamping the edit pages in Projects. Specifically:

• Remove EditMainController
• Move actions from EditMain to Profile
• Move properties from EditMain to Profile
• Move timeline from EditMain to Profile
• Move Open Tasks from Profile to sidenavicon
• Add custom icons and colors to timeline

Feel free to bang on this a bit and give feedback, feels generally correct to me.

Test Plan: Edit everything I could on various projects. Check links, timelines, actions.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11421