speed-dependent spray usage

With this mod, the fertilizer consumption is adapted to the current speed. Example: If a slurry tanker consumes 600 liters per second at 20 km / h, it only consumes 300 liters per second with the mod at 10 km / h. So you do not have to drive the maximum speed to waste any fertilizer. Works with syringes, fertilizer spreaders, lime spreaders, manure spreaders and slurry tanks. The mod was not tested in multiplayer