symbolZElevate

Position symbol on buildings (both fill extrusions and models) rooftops. In order to have minimal impact on performance, this is supported only when {@link PropertyFactory#fillExtrusionHeight} is not zoom-dependent and remains unchanged. For fading in buildings when zooming in, fill-extrusion-vertical-scale should be used and symbols would raise with building rooftops. Symbols are sorted by elevation, except in cases when viewport-y sorting or {@link PropertyFactory#symbolSortKey} are applied.