[XB] Content User Change 2.1.0

Fixed the Change User action for resource reviews and resource updates reading the wrong route parameter, causing the ownership change to fail.
Improved the bulk ownership change and guest content association jobs by wrapping each content item update in its own database transaction, preventing partially applied counter and last-post updates if processing is interrupted.
Fixed the stored username text not being updated alongside `user_id` when changing the owner of profile posts, profile post comments, XFMG albums, media items, media comments, resource updates, and the first post of a thread.

Fixed inline moderation tool work on XFMG media items

Fix: thread last post info not updated when changing post owner

Added ACP tool to bulk change content ownership for users and guests

Fixed an issue where the thread owner was incorrectly updated when changing the post owner

Fixed updating of user post count in a thread after changing the post owner

To fix the counter on old threads, do "Rebuild threads" with "Rebuild post position and post counters":