Chemistry nerfs

[Mouse]

The change to both smoke powder and propellent that broke loads of groups made it so that it uses all ingredients regardless of the amount used.

For example just add 5u of potassium, 5u of phosphorus and 50u of sugar. You'd expect a cloud of sugar but the remaining 45u just vanishes.

If I'm not mistaken that's to fix an acknowledged exploit that results in reactions that last indefinitely as long as anything that metabolizes chems is in the cloud.