get_plugin_list
Description:
Returns the list of [struct@PluginInfo] known to the engine.
Parameters:
| this | A Engine. | 
Returns:
| a List of PluginInfo. Note that the list belongs to the engine and should not be freed. | 
Returns the list of [struct@PluginInfo] known to the engine.
| this | A Engine. | 
| a List of PluginInfo. Note that the list belongs to the engine and should not be freed. |