Secret Button to set everyone's mutant race

Mostly as a way to reverse the consequence of an badmin's lapse of good judgement (There's no easy way to reverse the Halloween event button.). This can also be used for an assortment of badminning.

code/modules/admin/topic.dm

@@ -1582,6 +1582,15 @@
 					spawn(0)
 						H.monkeyize()
 				ok = 1
+			if("allspecies")
+				var/result = input(usr, "Please choose a new species","Species") as null|anything in species_list
+				if(result)
+					log_admin("[key_name(usr)] turned all humans into [result]", 1)
+					message_admins("\blue [key_name_admin(usr)] turned all humans into [result]", 1)
+					for(var/mob/living/carbon/human/H in mob_list)
+						var/newtype = species_list[result]
+						H.dna.species = new newtype()
+						H.regenerate_icons()
 			if("corgi")
 				feedback_inc("admin_secrets_fun_used",1)
 				feedback_add_details("admin_secrets_fun_used","M")