Nyall Dawson 55226f56ad Use some heuristics to guess when a raster layer looks like a DEM
and auto-set the "represents elevation" flag for these

We do this when:

- the layer contains only one band
- the data type is int or float (not complex, rgb or byte)
- the layer doesn't have an attribute table
- there's something "dem-like" in the layer's name (ie 'elevation',
  'dem', 'height', 'srtm')

This should help make the elevation profile tool more user-friendly,
as these layers will be included in the profiles by default
2023-05-19 23:06:21 +10:00
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