Use Oneof to handle polymorphism (set_position, set_servo_angle)

[jo-bru]

Use the Oneof keyword in the .proto description to handle the polymorphism of the motion methods. See proto3 docs for further information.

This may be used for the following methods:

• set_position()
• set_tool_position()
• set_servo_angle()

[iomz]

~I don't think this is a good idea. This will undermine the transparency.~

[jo-bru]

Hmm.. let's discuss this in today's meeting

[iomz]

My bad, I take down the first comment.