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