[cXF] Conversation Button 1.3.1

• changed template modification for better compatibility

• added option to show conversation button above or below user extras in message user info (postbit)

• changes made to work with XF 2.1
• new option in style properties: choose FA icon to suit your needs

NOTE: update only when you upgrade your forum to XF 2.1

• added an option to add thread title to a new conversation

• bugfix: error shows up if the guest post is in the thread