Move layer's tool to a panel into the layer's list

[pelord]

Please tell us about your environment:

• Igo Version:
  1.0.0-alpha

Button/feature/component multiplication inside the layers list is sometime harassing/non functional

The proposal is to create a panel at the bottom of the list of layers to group this tool inside the panel and access to these tool by click on more_horiz button.

The include tool a this time: layer opacity, layer upward/downward and filters (ogc and temporal)

[pelord]

Here the proposal

[ameliebernier]

I suggest that the filters appear at the bottom too, instead of under each layer. I think the space under each layer should be reserved for the legend, with a button to expand or collapse them all.

See #507

[pelord]

+ 1

[ameliebernier]

Inclus dans infra-geo-ouverte/igo2#397