Enable "cm.debug.viewTree()" on production

[njam]

The idea was for product development to have a tool to quickly see the view-structure of a page.
Unfortunately cm.logger.info() is not visible on production.

@zazabe what's the best way here?
Could be only for users with the developer role.

[zazabe]

one way, already available:

[njam]

I was hoping to have the DevTools-reference to the "HTMLDivElement". This way when you hover over it the element is highlighted in the viewport.

[zazabe]

It's more a hack, but we can easily change the viewTree() implementation and not use the logger at all.
We could even use console.group(), like this:

[zazabe]

see #2556

[njam]

Done in #2556

@NicolasSchmutz let's discuss