Adds Tajaran Nose marking, Doubles up Ear Stuff for added Customization, Fixes Alt Head Prefs Bug + More Sanity, Refactors Morph Again, ....

Adds 5 more Tajaran hair styles, sprites from Polaris and fixes an issue
where Tajara and Vulpkanin couldn't be bald in character preferences.

The alt head prefs bug became prevalent if you spammed the 'reload slot'
button on certain characters. They'd get an alt head and if you switched
slots it wouldn't go away-- breaking head icon generation. Woops. Not a
problem anymore because the var isn't initialized to null and is
corrected in the prefs screen. Also refactors the morph ability to use
the change_whatever procs from appearance.dm. Removes redundant
update_body from force_update_limbs.

code/modules/client/preference/preferences.dm

@@ -131,7 +131,7 @@ var/global/list/special_role_times = list( //minimum age (in days) for accounts
 	var/r_eyes = 0						//Eye color
 	var/g_eyes = 0						//Eye color
 	var/b_eyes = 0						//Eye color
-	var/alt_head = null					//Alt head style.
+	var/alt_head = "None"				//Alt head style.
 	var/species = "Human"
 	var/language = "None"				//Secondary language
 
@@ -1268,6 +1268,7 @@ var/global/list/special_role_times = list( //minimum age (in days) for accounts
 						m_styles = "head=None;\
 									body=None;\
 									tail=None" // No Unathi markings on Tajara
+
 						alt_head = null	//No alt heads on species that don't have them.
 
 						body_accessory = null //no vulptail on humans damnit