Description of the issue
---------------------------------------------------------------------------------
Meeting names longer than 60 chars cause the activity creation to fail

Expected Behaviour
---------------------------------------------------------------------------------
Enforce title length (taking into account group name length) at time of creation

Resolution
---------------------------------------------------------------------------------
1. Not in group mode: Change max title length from 256 (Moodle limitation) to 60 (AC server limitation). Error message: 'Maximum of 60 characters'.
2. In group mode: make sure that (string length of meeting title + 1 character (for the underscore) + string length of longest group name) does not exceed 60 characters. Error message: 'Meeting title cannot exceed (60 - 1 - %string length of longest group name%) characters due to the length of group names in use.', or if there is a group name longer than 59 characters: 'Course group names are too long (longest is %string length of longest group name% characters). Total length of Meeting title (which will have group name appended) cannot exceed 60 characters.'

Notes
---------------------------------------------------------------------------------
I have found evidence of the 60 character limit on the AC server elsewhere, e.g. http://kb.iu.edu/data/armk.html : "Enter a name for the meeting, limited to 60 characters."

Patch and github repo
---------------------------------------------------------------------------------
Links to be provided in comments section once I get a tracker number for this issue