Add joysticks and buttons

[jkleiber]

Summary There need to be joysticks and buttons declared in RobotContainer.h and initialized in RobotContainer.cpp

Work to Do

• Add Joysticks and JoystickButtons in RobotContainer.h
• Initialize Joysticks/Buttons in RobotContainer.cpp in an initialization function

Verification

• Joysticks and buttons are added correctly to RobotContainer

Deferred Work

• Each subsystem should add button bindings appropriately as part of their work

[jkleiber]

@AbbeySieg since you're already sort of working on this, I'm assigning it to you

[AbbeySieg]

@jkleiber I think I did it, but I'm not sure

[danielbrownmsm]

what branch was this on? I thought @AbbeySieg finished it, but I could be misremembering things

[jkleiber]

This work has been done as part of the hardware branch and is now on master. We can close this