Started expanding auxgm a bit

code/__DEFINES/atmospherics.dm

@@ -1,12 +1,3 @@
-//LISTMOS
-//indices of values in gas lists.
-#define META_GAS_SPECIFIC_HEAT	1
-#define META_GAS_NAME			2
-#define META_GAS_MOLES_VISIBLE	3
-#define META_GAS_OVERLAY		4
-#define META_GAS_DANGER			5
-#define META_GAS_ID				6
-#define META_GAS_FUSION_POWER   7
 //ATMOS
 //stuff you should probably leave well alone!
 #define R_IDEAL_GAS_EQUATION	8.31	//kPa*L/(K*mol)

code/__DEFINES/mobs.dm

@@ -343,3 +343,7 @@
 
 ///Define for spawning megafauna instead of a mob for cave gen
 #define SPAWN_MEGAFAUNA "bluh bluh huge boss"
+
+// / Breathing types. Lungs can access either by these or by a string, which will be considered a gas ID.
+#define BREATH_OXY		0
+#define BREATH_PLASMA	1