Add AppointmentTemporalEmailState enum, add mail states to AppointmentTemporal, implement async emailing in Mailer (WIP)
- Add EmployeeEmail property to Schedule
- Add IAppointment.Availability and ISchedule.Availabilities properties
- Add Facade.FetchAppointment and Schedule.FetchAppointment methods
- Add SMTP credentials to config files
- Convert Mailer to console application
Merge branch 'master' of https://github.com/Choonster/AMS