Add gesture rotation

[kattni]

The APDS9960 is rotated 90 degrees on the CLUE, therefore the gestures are off by 90 degrees.

Add the ability to compensate for sensor rotation by including gesture rotation.

The other capabilities of the sensor are not affected by rotation.

[kattni]

@FoamyGuy Let me know if you'd be interested in taking this on.

[FoamyGuy]

@kattni I'm definitely willing to give it a try. I think I can do it. Do I understand correctly: user will be able to set rotate to 0, 90, 180, or 270. If the rotation is set then the values returned by .gesture() will be manipulated to the desired rotation. i.e. if rotation is 90 and the "real" gesture detected is 1 #UP instead what will get returned is 4 #RIGHT

[evaherrada]

Solved by #26. Closing