Beta Allison Transmission megapack 3.1

Slight name change for the Allison HT746, was named HT740, but not a big issue.

Fixed an issue with the Allison 4430 Series transmission, I forgot to put a comma between 0.76 (6th) and 0.67 (7th) gear.

Added support for two new vehicles that were just introduced in v0.38 of BeamNG.Drive.

These new vehicles are the Hirochi HT-55 haul truck and the Hirochi WL-40 wheel loader.

Both vehicles have two new differential ratios of 3.73:1 and 4.10:1

Hirochi HT-55 will be getting the following transmissions.

Allison 3500 Wide
Allison 3700 Close
Allison 4430 Wide
Allison 4700 Deep
Allison 4870 Wide
Allison 5600 Series
Allison 8600 Series
Allison 9600 Series

Hirochi WL-40 will be getting the following transmissions.

Allison CLBT 755
Allison HT746