TFMG: Fix engine controller

You may have noticed that the Engine Controller in (https://modrinth.com/mod/create-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.

(https://www.youtube.com/watch?v=jca-FNJS_zg)

### 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.