Add wheel angular speed

[erikbosch]

Fixes #678 Related to #677

I suggest that we add a new signal rather than "refactoring" the old, as there might be use-cases where linear speed is useful, like if you have a passive TPMS system (and different wheel sizes) or if you use the average speed of individual wheels) with different size) to calculate Vehicle.Speed

Also changing description of existing signal, but semantics should be the same. I used degrees/s as unit as that is the only unit we currently have for angular velocity. As I see it it would not be a problem for us to add radand rad/s to the list of supported units and use rad/s if we prefer that.

While discussing angular/rotation-speed it can also be worth mentioning that as of today we have two different quantities:

• angular-speed (supported unit degrees/s)
• rotational-speed (supported unit rpm)

Do we see a need to keep both quantities; cannot rpm also be considered as a form of angular speed, and at least for something rotating with constant speed it is easy to convert between degrees/s and rpm.

[erikbosch]

MoM:

• Please review, possible merge decision next week

[erikbosch]

MoM:

• Merge