ActionController::Parameters no longer inherits from HashWithIndifferentAccess

There were validation errors because `answer.poll` wasn't set.

Fixes #7521

Fix Person.in_aspects scope to return each person only once when the
person is in multiple aspects.

This commit introduces changes to the user data export archive format.
This extends data set which is included in the archive. This data can be
then imported to other pods when this feature is implemented.

Also the commit adds the archive format json schema. ATM it is used in
automatic tests only, but in future it will also be used to validate
incoming archives.

Fixes #7245

Javascript refactorings for better maintainability:
* simplePreview function to avoid code duplication
* Preloaded conversation is processed in a slightly different way
* Split isPreviewOrTexareaNotEmpty function since it has more than one responsibility

We need to reinit autosize when we navigate in conversations with the backbone router.

This class implements methods that allow to query relayables (comments, likes, participations,
poll_participations) of other people for posts of the given person.

This class allows to query posts where a person made any activity (submitted comments,
likes, participations or poll participations).