Buffed repair speed for wheels, hover and cyborgs

[Monsterovich]

This PR increases the repair speed for low HP bodies. At first I was only planning to do it for wheels, but I decided to do it for everything else, including cyborgs, because it's more fair to them.

The main focus is on the wheels because they are pretty much useless in the game, if you don't like the rest of the changes in general we might as well not make them.

Motivation: primarily for wheels - units with low HP are destroyed very quickly on the battlefield: "If wheel units are faster to repair then they could more efficiently cycle between front and back line - but would remain at the front line less long due to reduced health." (C) PathForger

Changes:
The HP increment value is very low in Warzone (mostly +1hp or +2hp), which means multiplication will give the following result:

Wheels: 200% repair rate.

Change: +1hp → +2hp
Change: +2hp → +4hp

Hover: 150% repair rate.

Change: +1hp → +2hp
Change: +2hp → +3hp

Cyborgs: 125% repair rate.

Change: +1hp → +1hp
Change: +2hp → +3hp

...per cycle.

Note: any fractional repairFactor value between [1..1,25..1,5..1,75..2] is meaningless as it will be rounded anyway.

P.S. Not sure about hovers: but it probably wouldn't hurt to make a buff too or do you plan to use them only for flamethrower rush 😄 Maybe swap numbers with cyborgs?