Make it possible to add actions and filters that get added to the debugger

[alexstandiford]

It would be nice if actions/filters could be added with a wrapper, like so:

plugin_name_replace_me()->actions()->add();

This would allow us to add our hooks to the registry so we can see what hooks were added. We might even be able to make it so that we register what is actually fired.

[alexstandiford]

underpin()->actions()->add(); and underpin()->filters()->add(); would simply register these items.

underpin()->actions()->get( 'action' )->do()

and

underpin()->filters()->get( 'action' )->apply();

would actually do the thing.

underpin()->filters()->get( 'action' )->add(fn());

and

underpin()->actions()->get('action')->add(fn());

would do add_action and add_filter

As suggested, this would give a list of actions and filters registered for this specific plugin, as long as people actually used it appropriately.

This could also make it possible to chart out a history of what actions fired, and, log when these events fire at a higher level.