Feature Toggles
This is related to theme feature toggles provided by Drupal core. Themes and plug-ins can define sets of features adding to the pool of available features.
They must be set from the theme .info or plug-in .pinfo file.
feature set[FEATURE_KEY_1] = FEATURE_NAME_1
feature set[FEATURE_KEY_2] = FEATURE_NAME_2
; etc…
The FEATURE_KEY is the machine readable name and FEATURE_NAME is the human readable name used in the theme settings form. All feature keys must be unique and they cannot be overridden.
If the features are set within a plug-in, enabling it through the theme settings form will enable the plug-in. If none of the features are enabled for a plug-in, none of the code associated with the plug-in will ever load. This can keep code associated with the feature very focused on its purpose.
