UC100 (UC New)

This PR contains UC New or UC100, which allows a patient to cancel or edit a new appointment (aka requesting a similar one based off of the past details).

Created:

• The ability for the patient to cancel an existing appointment
• The ability for a patient to reschedule an existing appointment (form is pre-populated with current information)
• Additional unit tests for canceling and editing appointments
• Selenium tests

To test in iTrust:

1. Log in as a patient
2. Click on Appointments menu tab, and click on View/Edit Appointments
3. Try testing with the new Edit and Cancel Appointment buttons.

• Please note that it would not make sense for the patient to have the ability to edit their appointment details without approval from a HCP

To run the tests, do the following:

1. First, run mvn install -DskipTests to build and deploy the website (this will ensure that the selenium tests work as expected)
2. Run mvn test -Dtest=EditApptPatientActionTest and mvn test -Dtest=CancelApptPatientActionTest to run the unit tests
3. Run mvn test -Dtest=EditApptPatientTest to run the selenium tests