[For 1.8] MyConversations: a conversation plugin for MyBB

[Laird]

Pre-release #3 of MyConversations version 1.2.0 is currently being live-tested on Psience Quest and the demo creativeandcritical.net forums, where you can try out the new features. There are quite a few, but the main ones are:

• A search feature.
  
• A "mark all read" feature.
  

Here are a couple of screenshots of the search feature: