for layers with CRS inaccuracies
If the new "Show CRS accuracy warnings for layers in project legend"
is checked by a user, then any layers with a CRS with accuracy
issues (i.e. a dynamic crs with no coordinate epoch available,
or a crs based on a datum ensemble with accuracy exceeding the
user-set limit) will have a new warning icon reflecting that
the layer is a low-accuracy layer.
This is entirely opt-in, and designed for use in engineering/BIM/...
industries where inaccuracies of meter/submeter level are very
dangerous.
