[Andy] Direct message position 1.0

Description:

Adds message numbers to direct messages.

(Example of message numbers in direct messages)




(Example of Rebuild caches)




Setup:

After installing the add-on, go to Rebuild caches and click the Rebuild now button:

Admin control panel -> Tools -> Rebuild caches -> Direct message position -> Rebuild now

This only needs to be done once after initial installation of the add-on,

Database changes:

Adds a andy_direct_message_position column to the xf_conversation_message table.