Real-time motor coordinates overlay

[jsiegle]

The coordinates of each motor should be visible on the live image of the insertion system cameras.

This requires the following:

• Identifying which probe is associated with which set of motors. This can be done manually or automatically.
• Finding the probe tip and tracking it while it's in motion
• Overlaying local X/Y/Z coordinates for the associated motor
• Overlaying global X/Y/Z coordinates for the associated probe (once the coordinate transformation has been found)