Add minimal species to AramocoMech

Need at least things that are colliders, before can parse the chemkin file.
I also gave it the singlet/triplet CH2
Commented out a few fall-off reactions that had explicit colliders in AramcoMech

eg. H+O2(+HE)<=>HO2(+HE)
because RMG can't parse them currently. It only expects the collider to be called (+M)
Hopefully finally fix the wait-for-web-front-end loop.

Although, on second thoughts, this may just hide another bug.
Some AramcoMech species