Before this patch, if remote poll options have leading or trailing spaces,
the information stored locally won't match them, causing federated voting to
fail.
* Add voters count to polls
* Add ActivityPub serialization and parsing of voters count
* Add support for voters count in WebUI
* Move incrementation of voters count out of redis lock
* Reword “voters” to “people”
* Backend changes for custom emoji support in poll options
* Serialize poll emojis in REST API
* Render custom emojis in poll options
* Render custom emoji in poll options on public pages
* Add UI for enabling/disabling poll notifications
* Add poll notifications to the (advanced) quick filter bar
* Update poll notification message
“Your poll has ended” → “A poll you have voted in has ended”
* Clear up associated notifications when a poll is deleted
* Add polls
Fix#1629
* Add tests
* Fixes
* Change API for creating polls
* Use name instead of content for votes
* Remove poll validation for remote polls
* Add polls to public pages
* When updating the poll, update options just in case they were changed
* Fix public pages showing both poll and other media
