HSI km range readout drum movement

[sniporbob]

A clear and concise description of what the bug is.
The range readout on the HSI has digits that move individually when sudden large changes in range occur, such as changing waypoints. The digits should roll over incrementally instead of all moving independently of one another.

Additionally, the digits "reset" themselves when crossing between 9 and 0 or vice versa, instead of rotating continuously.