Species whitelist for traits

Tunes up the trait system to have a whitelist AND a blacklist so you can choose whichever makes you have to write the lowest amount of code

code/modules/client/preference_setup/vore/07_traits.dm

@@ -41,7 +41,7 @@
 	S["traits_cheating"]	>> pref.traits_cheating
 	S["max_traits"]		>> pref.max_traits
 	S["trait_points"]	>> pref.starting_trait_points
-	
+
 	S["custom_say"]		>> pref.custom_say
 	S["custom_whisper"]	>> pref.custom_whisper
 	S["custom_ask"]		>> pref.custom_ask
@@ -58,7 +58,7 @@
 	S["traits_cheating"]	<< pref.traits_cheating
 	S["max_traits"]		<< pref.max_traits
 	S["trait_points"]	<< pref.starting_trait_points
-	
+
 	S["custom_say"]		<< pref.custom_say
 	S["custom_whisper"]	<< pref.custom_whisper
 	S["custom_ask"]		<< pref.custom_ask
@@ -179,7 +179,7 @@
 	. += "<a href='?src=\ref[src];blood_color=1'>Set Color</a>"
 	. += "<a href='?src=\ref[src];blood_reset=1'>R</a><br>"
 	. += "<br>"
-	
+
 	. += "<b>Custom Say: </b>"
 	. += "<a href='?src=\ref[src];custom_say=1'>Set Say Verb</a><br>"
 	. += "<b>Custom Whisper: </b>"
@@ -345,7 +345,7 @@
 				pref.gross_meatbag = 0	//Just to be sure
 				return TOPIC_REFRESH
 
-			if(pref.species in instance.banned_species)
+			if(pref.species in instance.banned_species || (LAZYLEN(instance.allowed_species) && !(pref.species in instance.allowed_species))) //CHOMPEDIT: Whitelising!
 				alert("The trait you've selected cannot be taken by the species you've chosen!","Error")
 				return TOPIC_REFRESH