Add "hidden" property to global settings

- Allows certain settings to be hidden from the javascript files

InvenTree/part/templatetags/inventree_extras.py

@@ -251,6 +251,15 @@ def global_settings(*args, **kwargs):
     return InvenTreeSetting.allValues()
 
 
+@register.simple_tag()
+def visible_global_settings(*args, **kwargs):
+    """
+    Return any global settings which are not marked as 'hidden'
+    """
+
+    return InvenTreeSetting.allValues(exclude_hidden=True)
+
+
 @register.simple_tag()
 def progress_bar(val, max, *args, **kwargs):
     """