Description
Displays the legend of the ArcGIS & WMS layers visible in the current extent of the map

Acceptance criteria
- Displays in a modal the legend of the ArcGIS & WMS layers visible in the current extent of the map and so automatically adapts its content on zoom in/out, pan or layers visibility toggle on/off
- Displays the legends in the same hierarchy as the Layer List
Other useful information
To see if that can be properly integrated in the TOC