Nyall Dawson c52b2d3ce4 Show a layer tree next to elevation profile plots
This:

- Allows users to turn on or off the visibility of layers from
the profile plot on a plot-by-plot basis (previously the layer
visibility was taken straight from the main canvas layer visibility)
- Allows users to rearrange the drawing order of layers in the plot
- Allows a shortcut to the layer elevation properties settings by
double clicking layers
- Provides a "legend" for the features visible on the plot
2022-04-22 13:07:16 +10:00
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