[MERGED PR] Cyborg movement speed rebalance

[Ikea]

My usual build is Screenhead + Light Parts. Yeah I know, no treads on RP? Impossible! Jokes aside I haven't noticed much of a difference at all and I'd consider this a positive - change seems to be targeting the actual issues with borg speed (treads being too fast, heavy being too slow) without interfering with speeds I previously found to be completely fine to play against & with (Screenhead + Light, no treads or Speed Upgrade). So far has seemed good imo!

From the spreadsheet, it looks like full light borgs and screen head did not have any changes in their effective speed.

In this specific case it is a slight benefit to speed (1.6 was old, 1.5 is new) as the light head speed modifier is less (more?) compared to previous values, meaning that swapping to a non light head slows you down less.