Allow exporting calendar bookmarks to Google Calendar/Outlook/3rd Party Programs

We use external tools to track when certain members of our team are available/unavailable. It would be great to not schedule releases of features when that person will be out, and it would be great to see dates generated within Aha! within those tools.

Provide the ability to export a certain bookmark as an ICS file. This could then be added to Ical/outlook/google etc.