Collaborative Threads 2.13.0

• Require XenForo 2.1+
• Update README.md with post-install configuration instructions
• Add options icon
• Add option to disable 'thread starter alerts' integration for "always collaborate" permission
• Add collaborative post edit option during replies (more options) and on new threads
• Allow viewing of the per-post "Allow edits from collaborators" option for existing collaborative posts when the thread starter can no longer manage collaborative threads
• Allow setting per-post "Allow edits from collaborators" option before thread collaborators are added

• Fix error deleting ad-hoc per-thread groups that still has members

• Fix possible "[E_NOTICE] Undefined index: "

• Allow the thread starter in a collaborative thread to participate in collaborative post editing that other collaborators have started

• Fix removing a collaborative group with user in it throws exception
• Reduce SQL queries added during search indexing
• Send alerts when a user is added as a collaborator to a thread
• Send alerts when a user changes ad-hoc groups in a thread (ie del+add op)

• Fix XF2.1 support

• XF2.1 support
• Allow collaborators of the 'first thread' to edit an attached threadmark index
• Minor code cleanup

• Fix issue where error message is suppressed when using collaborative threads
• Ensure when edit history is disabled it stays disabled with the svCollaborativeHistory option set

• Fix "Call to a member function isCollaborator() on integer" when deleting a forum

• Fix inconsistent permission evaluation due to unexpected cache clearing (resulting in a viewer not being considered a collaborator in some contexts).