* default endpoints no longer make sense
* follow upstream logic of configured vs effective default nodes
* store node names in json inside the metadata, as upstream does
* add default video source
The component loader is a more generic and extensible mechanism
of loading components; modules are one type of component...
The idea is to make scripts and config files also be components,
loaded by plugins that inherit WpComponentLoader
* use the activate/deactivate system from WpObject,
which allows async activation and error reporting
* drop 'module' property, use 'core' from WpObject
