Adjusted flying agent GUI behaviour for coorindator mode to be able to use the increment setpoint buttons in a meaningful fashion

Tested to be working and added highlighting the tab label for the controller that is operating. Next step is to add tabs for the remote and picker controllers, add service for getting the currently operating controller, and switch and PPSClient from the safe controller to the default controller.

Added the custom button support to the new GUI, and added a get setpoint service. The Default and Student controller tabs are now fully integrated for the agent and coordinator mode. Needs testing.

Prepared the Qt side of things for connecting the default and student controller tabs with ROS. Next step is to add and test the ROS-side code

Added new tabs to the flying agent GUI as separate classes. The classes still need to be implemented