Issue #2947739 by Jaypan: Refactoring JS, separating three different integration types into separate scripts, so that they are only loaded if/when they are needed

Issue #2947739 by Jaypan: Ensuring that the nodejs room is changed when the user changes threads. Adding comments to code

Issue #2947739 by Jaypan: Setting private message node js script to work from /thread channel. Still need to integrate a channel per thread

Issue #2947739 by Jaypan: Spun out Nodejs connection URL to configuration, configurable on the private message settings page

Issue #2947762 by Jaypan: New feature: Hide members field private message create page, when recipient set in the URL

Issue #2949093 by Jaypan: Add option for notifications to only be sent if the user is not on the private message page

Issue #2949093 by Jaypan: Add option for notifications to only be sent if the user is not on the private message page

Fixing bug for private message inbox block, where Drupal.behaviors is firing before the block is loaded into the page.

Adding categories to private message blocks. Fixing issue with missing category for actions block on block layout page

Issue #2962096: Unable to install Private Message due to unmet dependencies: block.block.actions (bartik)

Issue #2962872 by Jaypan: Static calls in PrivateMessageThreadMemberWidget need to be converted to dependency injection