Fix a crash with new versions of Hbm's NTM, since in new versions GAS_CHLORINE was replaced with GAS_LUNG
Fix a bunch of logic errors with gases, this includes bugs where poisoning was not applied to the player, even if he didn't have any protection (the mod considered that the player was in creative, even if he was in survival, or he considered that the player already has a mask, although there was none)
Add a bunch of configuration options related to the characteristics of poisoning (how long the effect is applied, what level the effect is, how dense the gas should be for poisoning, etc.)