This does not deprecate any current functionality, but prepares the way for future deprecation.
The drive classes now accept void(double) functions, which makes them more flexible.
The C++ API ended up a bit more verbose, but the Java API is really concise with method references, which is >80% of our userbase. For example:
`DifferentialDrive drive = new DifferentialDrive(m_leftMotor::set, m_rightMotor::set);`
Lambdas can be passed to interoperate with vendor motor controller APIs that don't have e.g., set(double), so CTRE doesn't have to maintain their WPI_ classes anymore.
MotorControllerGroup was replaced with PWMMotorController.addFollower() for PWM motor controllers. Users of CAN motor controllers should use their vendor's follower functionality.
All trigonometric functions and vector classes assume North-West-Up axes
convention, so using North-East-Down convention with them is really
error-prone. We've broken something every time we touched the drive
classes.
We originally used North-East-Down to match the joystick convention, but
the volume of long-lived bugs has made this not worth it in retrospect.
The rest of WPILib also uses North-West-Up, so this makes things
consistent.
KilloughDrive was removed since no one uses it.
If xSpeed == -0.0 and zRotation > 0, the algorithm assumes it's in the
third quadrant instead of the first since +0.0 == -0.0.
Also added tests for inverse kinematic functions, fixed some
MecanumDrive test bugs, and added Java MecanumDrive.driveCartesianIK()
and KilloughDrive.driveCartesianIK() overloads with defaulted gyro angle
that C++ already had.
Fixes#4022.
