Revert "Un-kevinzes nanoui and chemistry subsystems back into processes for greater good"

code/controllers/subsystems/processing/chemistry.dm

@@ -0,0 +1,43 @@
+PROCESSING_SUBSYSTEM_DEF(chemistry)
+	name = "Chemistry"
+	wait = 20
+	flags = SS_BACKGROUND|SS_POST_FIRE_TIMING
+	init_order = INIT_ORDER_CHEMISTRY
+	var/list/chemical_reactions = list()
+	var/list/chemical_reagents = list()
+
+/datum/controller/subsystem/processing/chemistry/Recover()
+	chemical_reactions = SSchemistry.chemical_reactions
+	chemical_reagents = SSchemistry.chemical_reagents
+
+/datum/controller/subsystem/processing/chemistry/Initialize()
+	initialize_chemical_reactions()
+	initialize_chemical_reagents()
+
+//Chemical Reactions - Initialises all /datum/chemical_reaction into a list
+// It is filtered into multiple lists within a list.
+// For example:
+// chemical_reaction_list["phoron"] is a list of all reactions relating to phoron
+// Note that entries in the list are NOT duplicated. So if a reaction pertains to
+// more than one chemical it will still only appear in only one of the sublists.
+/datum/controller/subsystem/processing/chemistry/proc/initialize_chemical_reactions()
+	var/paths = typesof(/datum/chemical_reaction) - /datum/chemical_reaction
+	SSchemistry.chemical_reactions = list()
+
+	for(var/path in paths)
+		var/datum/chemical_reaction/D = new path()
+		if(D.required_reagents && D.required_reagents.len)
+			var/reagent_id = D.required_reagents[1]
+			if(!chemical_reactions[reagent_id])
+				chemical_reactions[reagent_id] = list()
+			chemical_reactions[reagent_id] += D
+
+//Chemical Reagents - Initialises all /datum/reagent into a list indexed by reagent id
+/datum/controller/subsystem/processing/chemistry/proc/initialize_chemical_reagents()
+	var/paths = typesof(/datum/reagent) - /datum/reagent
+	chemical_reagents = list()
+	for(var/path in paths)
+		var/datum/reagent/D = new path()
+		if(!D.name)
+			continue
+		chemical_reagents[D.id] = D