User Activity by Xon 2.13.4

• Block installing if Redis is not installed & configured
• Fix 'avatar' display type not working

• Fix Content Rating support
• Add default permission configuration on install
• Tweak permission layout.

• Version bump to 2.0.0, as 1.x.y is for the XF1 version
• Rework Content Ratings (upcoming add-on) support to add activity to the container not the content where possible.
• Properly support accessing Like/Likes as counting as activity for a thread

• Depending on Redis Cache 1.1.0
• Support likes as recent activity in a thread
• Support Content Ratings (up coming add-on) as activity against some content