TFMG: Fix engine controller

You may have noticed that the Engine Controller in TFMG (The Factory Must Grow) does not implement a clutch and gear shifting. This mod files that by adding proper clutch and gearbox functionality. It also adds a configuration item that allows you to change the gear ratio of any gear. To shift gears, you need to hold down the clutch.

Demostration

CREDITS:

Using textute gui from Create mod