public PluginFeature? load ()
Loads the plugin containing this if it's not already loaded.
this is unaffected; use the return value instead.
Normally this function is used like this:
loaded_feature = gst_plugin_feature_load (feature);
// presumably, we're no longer interested in the potentially-unloaded feature
feature = loaded_feature;
the plugin feature to check
a reference to the loaded feature, or