Add boilerplating for drone object, position data

This is all very preliminary, but for the moment the thought is that the drone
has controls that go directly to the drone, and that comparisons between
points, etc. take place using methods of the class Point.

Crazyflie currently inherits everything from Drone.
Finish boilerplating.

As of this point, I'm considering the boilerplating enough to start my own
branch and continue development there.