DNA2 Bug Fixes - Part 2 (CHERRY PICK)

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.

Conflicts:
	code/game/dna/dna2_domutcheck.dm
	code/game/dna/genes/powers.dm

code/game/objects/items/weapons/dna_injector.dm

@@ -72,7 +72,7 @@
 	if (!(NOCLONE in M.mutations)) // prevents drained people from having their DNA changed
 		if (buf.types & DNA2_BUF_UI)
 			if (!block) //isolated block?
-				M.UpdateAppearance(buf.dna)
+				M.UpdateAppearance(buf.dna.UI.Copy())
 				if (buf.types & DNA2_BUF_UE) //unique enzymes? yes
 					M.real_name = buf.dna.real_name
 					M.name = buf.dna.real_name
@@ -83,7 +83,7 @@
 				uses--
 		if (buf.types & DNA2_BUF_SE)
 			if (!block) //isolated block?
-				M.dna.SE = buf.dna.SE
+				M.dna.SE = buf.dna.SE.Copy()
 				M.dna.UpdateSE()
 			else
 				M.dna.SetSEValue(block,src.GetValue())