Preview image for nodes with binary_fields

## Gentics Mesh Version
- 0.11.3

## Problem
for web projects the usecase of having a node only containing an image is very common.
When maintaining a long list of these nodes it is hard to differenciate only by the displayname.

## Reproducer

## Expected behaviour and actual behaviour
A thumbnail image (in listview and in "Select node..." dialog (grid and list)) would help allot.

Start by locating the node list view and the "Select node..." dialog, including their grid and list presentations, then trace how nodes with binary_fields expose image data. Done means image-only nodes show useful thumbnail previews in every view named in the issue, alongside their display names.

Written by the indexing model from the issue text.