remove or severely nerf chemgroups

[getbrecked]

I don't think chemgroups are a very balanced system, due to how insanely broken certain mixes can be, but outright removing them does nothing but make chemistry less fun. Removal of chemgroups, in a way that makes the production of certain chemicals less of a bore, would require a lot of recipe changes. Look at Pentetic Acid for an example - it's a pain in the ass to make manually, which is where chemgroups come in. We should focus on the chem features that are actually broken (such as nitro and propellant) rather than removing groups as a whole.