also, add support for loading lua config files, denoted by the
"config/lua" component type

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

deactivate() is normally called from WpCore's dispose() and
that's too late to convert a weak WpCore ref to a strong one,
so we cannot find the WpConfiguration and remove the engine.
So, keep a reference to the WpConfiguration earlier.

If the engine is not stopped on time, proxies on the export_core
are destroyed after their core and pipewire complains

a module that allows loading and executing Lua
scripts from a configured directory