* wip
* remove dupe
* use poll model relations in all cases
* update mpollbody tests to use poll instance
* update poll fetching login in pinned messages card
* add pinned polls to room polls state
* add spinner while relations are still loading
* handle no poll in end poll dialog
* strict errors
* render a poll body that errors for poll end events
* add fetching logic to pollend tile
* extract poll testing utilities
* test mpollend
* strict fix
* more strict fix
* strict fix for forwardref
* update poll test utils
* implicit anys
* tidy and add jsdoc
We're anticipating development of polls soon, so for efficiency reasons we're getting the labs flag in early. If something goes wrong with the plan, this whole change will be reverted.