Limit calendar event titles to 200 chars

Although we were already limiting calendar event titles to 255 chars to make them Outlook compatible some users still report errors when adding calendars which incidate to long titles.

We suspect calendar events which contain emojii in their title to be the culprit. Unicode emojis string length is highly dependend on the programming language used. As we do not know how exactly outlook evaluates string length we can only guess what (ruby) length is appropriate.

By limiting the string to (ruby) 200 chars we hope to circumvent this problem in almost all cases.