MyConversations: releases and other announcements

[Laird]

MyConversations version 1.2.5 has just been released.

New features:

• A bunch more warnings under PHP 8 have been resolved, along with the minor bugs that some of them revealed. This improves the plugin's compatibility with PHP 8.
  
• Improves the responsiveness (mobile-friendliness) of the plugin's pages.
  
• Provides better global access to unread counts and related status messages for use in templates, via `$mybb->user`.
  
• Bugfix: A database error was occurring in the PMs->conversations migration due to the failure to supply an entry for the `likedby` column of the `cnv_messages` table, which requires a value.
  
• Bugfix: Auto-linking of bare URLs in messages was partly broken due to MyConversations mistakenly setting the parser option to allow HTML (which breaks auto-linking in MyBB core)..