Scale-dependent Attribute Visibility in Map Viewer Beta

[GISTeam8]

Add scale dependent visibility to layers by attribute in Map Viewer Beta.  This is not the same as scale-based symbol classes.  What this means is, for example with roads, the ability to show different road type attributes (e.g. highway, arterial, minor road) at different scales, as part of a single layer instead of making copies of that layer and using different filters on road type to achieve the same effect.