* Move rover-ros2/rover_launch.py to src/anchor_pkg/launch/, renamed to rover.launch.py
* Anchor now waits to initialize topics until after it has found a microcontroller.
* Headless now waits for anchor to start before it starts itself
* Add default cases to motor feedback for motorId
* Added black to the flake.nix and package.xml
Controller rumbles for 200ms when __init__() finishes, and angular is now cubic so turning control follows a curve rather than a straight line (y=x^3 instead of y=x)
Speed mode is set with bumpers, brake mode is set with 'A' button. Implemented through /core/control/state topic with custom message CoreCtrlState.
Also added Core measurements from Gabe, and did some general refactoring.
Left stick y is forward/backward, right stick x is turn/angular. Still uses duty cycle. Published on /core/twist. On headless, needs CORE_MODE constant changed to "twist" to use new Twist command.
Also added TwistStamped to core_pkg for /cmd_vel. Will use velocity control. Needs wheel measurements from Core CAD. Will be used for Autonomy.
