This is step one of many to use gasmix instead of int o2/he.
Right now some of these changes look ridiculous because after changing a
few lines we immediately go back to o2 = get_o2(gas). The reason is that I
wanted to convert a hand full of functions at a time. So in this commit I
only change validate_gas(), get_gas_from_events() and get_gasidx() to use
a struct gasmix instead of int o2, int he.
This state builds and survived some mild testing. Let's continue on top of
that.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
2bf46381a8