Create minimal editor view for small vertical screen layouts

[steve2507]

There's not really a way to properly visualize a flow in the editor on a narrow vertical screen layout. A phone in portrait mode for example would never be capable of showing the editor in such a way that it's useful.

A new view is recommended that simply shows all nodes in a flow in a vertical list. The order should try to mimic the processing order of a flow as close as possible (that's actually a tough thing to figure out).

Not sure yet how/if to visualize connectors in this view.

Editing should only be possible to the content of a node (input fields and such). Or perhaps this should be disabled completely.