Add scheduling/calendar support

[Christopher Kyle Horton]

One of our goals is to have the AI assistant be able to schedule classes and meetings, and give the user timely reminders of them. This will require the following:

• Process spoken commands for adding class times and meetings
• Use a database of some sort to store these things (maybe use Google Calendar integration later on?)
• Have a background daemon on startup wait for specific times before issuing a verbal and/or desktop notification for the reminder (maybe address this later in a separate issue)

It might be a good idea to give the user the ability to review scheduled events for the day, and cancel events if necessary.

[Christopher Kyle Horton]

I will take this task on and create a new branch for it.

[Christopher Kyle Horton]

This could be useful if we want to add Google Calendar support. All it requires is having pip install an extra package and getting a client secret for authentication.

[Christopher Kyle Horton]

We can now store events and read the ones scheduled for today as of bbbc20c . Marking this closed as the proof of concept is done; more advanced functionality can be implemented later if time allows.