fix get addons pref

remove edit line opacity
fix menus

utils.py

@@ -706,20 +706,7 @@ def set_collection(ob, collection, unlink=True) :
 # -----------------
 
 def get_addon_prefs():
-    '''
-    function to read current addon preferences properties
-
-    access a prop like this :
-    prefs = get_addon_prefs()
-    option_state = prefs.super_special_option
-
-    oneliner : get_addon_prefs().super_special_option
-    '''
-    import os
-    addon_name = os.path.splitext(__name__)[0]
-    preferences = bpy.context.preferences
-    addon_prefs = preferences.addons[addon_name].preferences
-    return (addon_prefs)
+    return bpy.context.preferences.addons[__package__].preferences
 
 def open_addon_prefs():
     '''Open addon prefs windows with focus on current addon'''