Improvements for global settings

- Name and description are defined in models.py
- Lookup functions for name / description / units / default
- Shortcut template for rending settings
- More unit testing

InvenTree/part/templatetags/inventree_extras.py

@@ -87,7 +87,34 @@ def inventree_docs_url(*args, **kwargs):
 
 
 @register.simple_tag()
-def inventree_setting(key, *args, **kwargs):
+def settings_name(key, *args, **kwargs):
+    """
+    Returns the name of a GLOBAL_SETTINGS object
+    """
+
+    return InvenTreeSetting.get_setting_name(key)
+
+@register.simple_tag()
+def settings_description(key, *args, **kwargs):
+    """
+    Returns the description of a GLOBAL_SETTINGS object
+    """
+
+    return InvenTreeSetting.get_setting_description(key)
+
+@register.simple_tag()
+def settings_units(key, *args, **kwargs):
+    """
+    Return the units of a GLOBAL_SETTINGS object
+    """
+
+    return InvenTreeSetting.get_setting_units(key)
+
+@register.simple_tag()
+def settings_value(key, *args, **kwargs):
+    """
+    Returns the value of a GLOBAL_SETTINGS object
+    """
     return InvenTreeSetting.get_setting(key, backup_value=kwargs.get('backup', None))