support for holonomic robots

[dwalton76]

This is a pretty cool robot, we do not have an API that makes this sort of robot easy: http://www.bartneck.de/2017/08/27/holonomic-lego-mindstorms-robot/

They used LeJos

The LeJOS EV3 API has the OmniPilot Class that makes controlling a holonomic robot easy

The only downside with this one is the $120 mouse that he used to control it. I bet a $10 PS3 controller could be used instead.

Somewhat related to #315 and #336

[dwalton76]

How-to for ev3dev with a PS3 controller http://www.ev3dev.org/docs/tutorials/using-ps3-sixaxis/