Add Calendar Element/Database Type

[Edward-Upton]

We will want to be able to add events to some sort of calendar.

This could be a new database base type with elements called Event with the following mandatory fields:

• Name/title
• Date (start and optional end time)

Additionally, could be given the fields:

• Description
• Location
• Invited (groups)

Could also make an Event View element that allows selecting an Event and displaying the information about it (essentially a fancy link to the event).