Add base files for conf editor and set route

It's accessible through app/#/conf_editor atm.
Refactor debug directive to make it reusable
Include debug directive in confEditor
Mild first try at a conf editor GUI
Rename hide to disable in navbar and use ngIf

We don't want to draw the element at all, if the navbar is disabled.
BREAKING Starts to restructure conf file design

For now, check the test suite and the short comment in configurator.
Will be explained in more detail soon.

This a breaking change.
Use a shortcut to arethusaUtil in spec
Add an insurance spec to arethusaUtil.pushAll
Add arethusaUtil.findNestedProperties
Add configurator.defineConfiguration()
Use defineConfiguration in main route
Wrap declaration of conf file mock in a beforeEach()
Begin to resolve external conf files ...

... that are embedded in a main conf file through the fileUrl property.
Load nested external conf files recursively
Updates staging2.json to new format
Fix staging2 config file
Update application to fulfil new conf structure
Extract morph attribute conf to an external file
Rewrite staging.json conf file
Guarantee that conf files load before startup

Check the huge comments inside of these commits.