Use double instead of int for the p_lod_distance_multiplier default value in
RendererSceneRenderForward::_render_shadow to match parent default value in
RendererSceneRenderRD::_render_shadow
-Happens on import by default for all models
-Just works (tm)
-Biasing can be later adjusted per node or per viewport (as well as globally)
-Disabled AABB.get_support test because its broken
