Added functionality for availability and requesting time off to the app. The app needs at least one employee in the database to run. Make sure to open the sql file in the repo drop your current table and execute everything from "create database" to the end of the availability table.

Employees table now captures the email, phone number, isManager, and wage.
Shift table now captures the availability of the shift. Updated parsing so all employee and shift details are separated by commas.

Changed the employees and shift collections from both being ArrayList<String> to HashMap<Int ID, Employee> and HashMap<Int ID, Shift> respectively. Refactored all methods that used the old employee and shift collections. Cleaned up some warnings.

Changed print all employees to remove the 'allEmployees' part. And made a function for getting the number of staff.

Added functionality to remove the employee shift by using the unique shift id to both the server and client side.

added attributes, get/set methods to model

This reverts commit c3032b36