cnc - vehicle speeds adjusted

Speeds - all vehicle speeds will get the same 0.8 ratio on clear terrain as tanks in the next commit to ^defaults.yaml. Speeds of vehicles here have been adjusted accordingly.
(RA mod has already done this and matched up vehicles & tanks with same 0.8 ratio)
APC speed reduced 10 -> 9
MLRS speed increased 6-> 7
Rotation speeds increased for: bike, buggy, jeep, APC, stnk, ftnk, ltnk
Bike speed increased on clear, reduced on road (before it was slower on clear than buggy; was too fast on road)
MCV slightly slower.