Add method(s) to invite a participant during a live meeting

[Jericho]

As I understand it, there are three ways to invite someone:

• [x] Send them an email
• [ ] Call them by phone
• [ ] Invite them by room system callout (I am not clear what the nuance between a phone call out and a room call out is)

EDIT: inviting participants by email has been available in the ZoomNet library since version 0.40.0.