Added a remove all shifts by employee id method to the Schedule class. Now when an employee is removed there shifts are deleted first from the database then they're deleted after.

Refactored updates so when changes are made to the database, a message will be broadcast to update there local copy with the specific change rather than send the entire list of staff or schedule.

Made changes to the Schedule class methods to return data that the client needs to update there local copy.
Cleaned up some spacing and variable names for consistency.
Cleaned up all the warnings.

Refactored how updates are handled, now when there is a change the client is told to update there local copy with the specific change, rather than resend either the whole list of employees information, or the whole list of shift information. This change to updates should make changes to the staff or schedule more efficient especially when there are multiple clients.
In coming data from the server is now stored in HashMaps where the key is either the shift or employee IDs, and the value is of Shift or Employee classes.
All the methods in this class were made to help with these 2 changes.
Cleaned up warnings.

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.

Implemented Employee class to make it easier to get employee data, handle changes to database, and for testing.

Changed update implementation for employees so rather than sending the whole list of employees when there are staff change, the server sends a message to all active clients to add/remove them locally. Also, changed all exception variable names to 'exception', and cleaned up warnings.

Added test code for creating schedules (adding shifts). Also added sleep statements for the client to receive the server responses. Changed getting the number of employees to the new employeeSize method in the model (should use the correct size now).

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

Changed code so that the information needed to connect to the database is passed to it by the server class