Summary: Modernize Dashboard edges to subclass `PhabricatorEdgeType`. Largely based on D11045.
Test Plan: Attached a panel to a dashboard, observed the expected comment in the transaction view (both ways).
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: epriestley
Differential Revision: https://secure.phabricator.com/D11114
Summary: Fixes T4985, add manage page, change view page to show only panels. Arguably, PhabricatorDashboardArrangeController is no longer necessary. Also, still trying to figure out if I updated all flows that involve "arrange/{id}". Probably missed some. Also not sure of the Manage Dashboard icon. Please advise.
Test Plan: Create dashboard, add panels, "view/{id}" should show just panels, Manage Dashboard should show timeline and edit links.
Reviewers: #blessed_reviewers, epriestley, chad
Reviewed By: #blessed_reviewers, epriestley
Subscribers: epriestley, Korvin
Maniphest Tasks: T4985
Differential Revision: https://secure.phabricator.com/D9258
Summary: To get there, upgrade "headerless" to "headerMode". Add a new removepanel controller. Fixes T5084.
Test Plan: removed some panels to much success
Reviewers: chad, epriestley
Reviewed By: epriestley
Subscribers: epriestley, Korvin
Maniphest Tasks: T5078, T5084
Differential Revision: https://secure.phabricator.com/D9156
