Add possibilty to send more e-mails before and after the webinar inluding schedule#42

Due to the fact that a lot of people forget a lot of things because they are ditracted by so many useless thing it is very helpful for us to be able to set up the numbers of neede email by our own.
It is necesary to help the attendees to keep our webinar in mind.
Additionally it is very important that the attendees receive the -email before 6 a.m. before they start their day.

For Examle: Reminder E-Mails

• 3 days before
• 2 days before
• 1 Day before
• 12 hours before
• 6 hours before
• 3 hours before
• 1 hour before
  -15 minutes before

For those who did not attend:

• directly after ther webinar
• 1 day after
• 2 days after
• 3 days after
• 4 days after
• 5 days after