Cannot be done in Ecto schemas because only one type is allowed in arrays, and
needs to be done before the MRFs.

Revert "Merge branch 'patch-fix-open-api-spec' into 'develop'"

See merge request !3385

This reverts merge request !3382

object_validator: Refactor most of validate/2 to a generic block

See merge request !3383

OpenAPI: Fix `date-time` being specified as an `integer` in OpenAPI spec (when it should be a `string`) in AccountCreateResponse

See merge request !3382

Upstream/mrf followbot

See merge request !3060

migrating config to tmp folder

Closes #2585

See merge request !3379

Copy emoji in the subject from parent post

See merge request !3378

Sometimes people put emoji in the subject, which results in the subject
looking broken if someone replies to it from a server that does not
have the said emoji under the same shortcode. This patch solves the problem
by extending the emoji set available in the summary to that of the parent
post.

respect content-type header in finger request

Closes #2579

See merge request !3375