cleaning up events

Update packages

Moving from CreateConfirmationEmailMessage (command) to use the AppointmentScheduledIntegrationEvent type.

Update sharedkernel reference

Rename ApplicationEvent to IntegrationEvent

Finish converting DateTimeOffsetRange to use DateTimeOffset everywhere

Update version of sharedkernel package

Revised version to 1.2.0 after nuget publish error said 1.1.6 already…

… existed.

Adding DateTimeRangeOffset to SharedKernel

updating project file

Update version number and description