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

Common user issues:

The shaft doesn’t rotate from the engine by default — you are in neutral gear. Shift into the next gear (check your control settings).

Gears won’t shift — you need to press the clutch to change gears.

Rotation speed doesn’t change between gears — you may have identical gear ratios. Try adjusting them using the controller configuration tool.

Gear ratio settings are not applied — the engine must be switched off to change them.