Modularize Dashboard transactions
Summary:
Depends on D20399. Ref T13272. I'm moving toward fixing all the "moving panels around on Dashboards breaks the entire world" problems.
On the way there, modularize Dashboard transactions.
Test Plan:
- Created a new Dashboard.
- Edited all fiedls of a dashboard.
- Archived/restored a dashboard.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13272
Differential Revision: https://secure.phabricator.com/D20402