Support "template objects" generically in EditEngine
Ref T9132. Ref T9908. Fixes T5622. This allows you to copy some fields (projects, subscribers, custom fields, some per-application) from another object when creating a new object by passing the ?template=xyz parameter.
Extend "copy" support to work with all custom fields.
- Created new pastes, packages, tasks using ?template=...
- Viewed new template docs page.
Reviewed By: chad
Differential Revision: https://secure.phabricator.com/D14699