Consider harsher runtime type restrictions on component input

[tpoomlmly]

In the setter for power in components/motor.py, booleans pass the new_power < -1 or new_power > 1 check and as such don't throw a ValueError. This might exist in other places.

[trickeydan]

Removed from 0.9.2 milestone, this is a tiny tiny bug. Students should read the documentation and expect errors in an duck typed language.

I think this issue should probably be developed into harsher runtime type restrictions on component input in general, as this issue is likely to be present in various bits of our codebase.