[New] Now the inspector can inspect from Agent to Element overviews

When the strolch restful classes are registered, the following API is
enabled:

strolch/inspector - overview of the realms
strolch/inspector/{realm} - ovierview of the elements in a realm
strolch/inspector/{realm}/order - overview of the orders
strolch/inspector/{realm}/resource - overview of the resources
strolch/inspector/{realm}/resource/{type} - overview of the resource
                                            types
strolch/inspector/{realm}/order/{type} - overview of the order types
strolch/inspector/{realm}/resource/{type}/{id} - get resource overview
strolch/inspector/{realm}/order/{type}/{id} - get an order overview

Getting details of the Resources and Orders is coming next