Add new chemicals (#5168)

Adds new drugs:
-Red Nightshade: a drug that induce a berserk-like status, you see only red, can smash windows, stuns go away slower and etc
-Paxazide: a medicine that induces pacifism on the target, like the mutation
-Spectrocybin: a hallucinogenic that has a small chance of giving a glipse of the other hidden to mere mortals, can be found in a mushroom variety

Adds a new secret chem:
-Bottled Lightning: causes a tesla zap when in contact with someone's blood or when splashed on the ground

Also removes some broken/unused plants.

code/game/modifiers/modifiers_chem.dm

@@ -109,4 +109,46 @@
 		var/mob/living/L = target
 		if(L.fire_stacks)
 			return 1
-	return 0
+	return 0
+
+//Berserk Modifier
+//Causes a hulk like effect
+
+/datum/modifier/berserk
+	var/last_shock_stage = 0
+
+/datum/modifier/berserk/activate()
+	..()
+	if(ishuman(target))
+		var/mob/living/carbon/human/H = target
+		to_chat(H, "<span class='danger'>An uncontrollable rage overtakes your thoughts!</span>")
+		H.add_client_color(/datum/client_color/berserk)
+
+		last_shock_stage = H.shock_stage
+		H.shock_stage = 0
+
+		H.SetParalysis(0)
+		H.SetStunned(0)
+		H.SetWeakened(0)
+		H.setHalLoss(0)
+		H.lying = 0
+		H.update_canmove()
+
+/datum/modifier/berserk/process()
+	if(..())
+		if(ishuman(target))
+			var/mob/living/carbon/human/H = target
+			H.drowsyness = max(H.drowsyness - 5, 0)
+			H.AdjustParalysis(-1)
+			H.AdjustStunned(-1)
+			H.AdjustWeakened(-1)
+			H.adjustHalLoss(-1)
+
+/datum/modifier/berserk/deactivate()
+	..()
+	if(ishuman(target))
+		var/mob/living/carbon/human/H = target
+		to_chat(H, "<span class='danger'>Your rage fades away, your thoughts are clear once more!</span>")
+		H.remove_client_color(/datum/client_color/berserk)
+
+		H.shock_stage = last_shock_stage