DNA2 Bug Fixes - Part 2

We discovered that most of the problems were were having was because of BYOND passing lists (e.g. SE and UI) by-ref instead of the assumed by-val.

This commit adds dna.Clone() and (UI|SE).Copy() where needed.  These should be used where DNA or SE/UI lists are COPIED, otherwise changes made in the reference will affect the real strand.

This change also messes with the gene activation logic.

code/modules/events/disease_outbreak.dm

@@ -30,8 +30,8 @@
 				continue
 			var/datum/disease/dnaspread/D = new
 			D.strain_data["name"] = H.real_name
-			D.strain_data["UI"] = H.dna.UI
-			D.strain_data["SE"] = H.dna.SE
+			D.strain_data["UI"] = H.dna.UI.Copy()
+			D.strain_data["SE"] = H.dna.SE.Copy()
 			D.carrier = 1
 			D.holder = H
 			D.affected_mob = H