Add proc set_viewsize() to allow hooking actions when client.view is changed.

- Proc is on mob to simplify the standard use case; maybe someday actually save it there too if desired.

code/modules/admin/verbs/randomverbs.dm

@@ -837,10 +837,12 @@ Traitors and the like can also be revived with the previous role mostly intact.
 	if(!holder)
 		return
 
+	var/view = src.view
 	if(view == world.view)
 		view = input("Select view range:", "FUCK YE", 7) in list(1,2,3,4,5,6,7,8,9,10,11,12,13,14,128)
 	else
 		view = world.view
+	mob.set_viewsize(view)
 
 	log_admin("[key_name(usr)] changed their view range to [view].")
 	//message_admins("<font color='blue'>[key_name_admin(usr)] changed their view range to [view].</font>", 1)	//why? removed by order of XSI