Nyall Dawson e036570c77 Setup framework for data provider's to provide information about
elevation related properties to their layers

And use this to ensure that wms tiles with maptiler terrain
or terrarium terrain interpretation are always included by
default in elevation profile plots.

Most specifically, this ensures that projects containing the
out-of-the-box "Mapzen Global Terrain" layer will be automatically
included in elevation plots.
2023-05-19 23:06:21 +10:00
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