RC Mode joystick mixing

[worlds6440]

Currently using tank driving mode where left and right sticks are used only for left and right throttles. Need to implement single stick driving mode.

[PKM-UK]

Provisional joystick mixing code is now in the joystick branch. Left Y axis throttle, right X axis steering, configurable expo and scaling in the code. It might steer the wrong way...

[worlds6440]

Cool.

I Think you meant the opposite here. Currently it will be using tank driving when not in tank mode.
if self.core_module:
if self.tank:
self.core_module.throttle(c_l_motor, c_r_motor)
else:
self.core_module.throttle(l_throttle, r_throttle)