Inform the user if they appear to have the old calendar plugin installed

This is one we can re-visit after getting support feedback post-1.0. The idea is that there are pages with the old macro being used... if they haven't migrated the calendars to the new plugin and were lazy, because we are using the same macro key, it might appear that the macro is broken.

At the moment we give them the error that we cannot find the calendar ID they have provided.

The old syntax looks like this:

{calendar:id=myCalendar|title=My Calendar|defaultView=week}

So what we could do? is if title or defaultView params are being passed, and we can't find the id of the calendar, in the error message we could say "It appears the new Team Calendar plugin is installed, however this macro is still using the old plugin. <LINK>Learn more</LINK> about migrating your calendar to the new Team Calendars plugin"

Let's leave this as a placeholder and see if support keep getting pinned for it..if they do,we can just put some notes on this ticket