Add graphical rotation vectors to ball spin feedback

[jamespilgrim]

Is your feature request related to a problem? Please describe.
To help debugging potential spin problems, PiTrac should draw rotation vectors on the second ball in the PiTrac GUI to help make clear the directions of spin in 3D.

Additional context
See Discord discussion here: https://discord.com/channels/1324384654731509770/1339292315868729404