Summary: Ref T9908. Fixes T8903. This moves the inline edit from task lists (but not from workboards) over to editengine.

Test Plan:
  - Edited a task from a draggable list.
  - Edited a task from an undraggable list.
  - Edited a task, changed projects, saw refresh show correct projects.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T8903, T9908

Differential Revision: https://secure.phabricator.com/D14711