[MMO] Live Threads 2.3.9

Shortened conditionals and got rid of unnecessary code blocks
Replaced multiple returns with early returns for better readability
Used DocumentFragment to reduce DOM repaints when adding multiple elements

Add user typing

Fixed a bug with other thread types.
Fixed a bug where the message's appearance would change in a way that was not consistent with the thread type.
Thanks a lot for testing and providing bugs

Min require 2.3.0
Using new pattern XF
Refactoring
Fixed If the add-on is installed and the centrifuge is not available, it does not allow you to create a thread or reply to it.

Support XF 2.3.0
Min require XF 2.3.0 Beta 3

Use of tokens