ColorMapper not initialized if Dynamic Colors are enabled by default

- move initialization of ColorMapper to code path for initial result
drawing
- remove onColorMapperChanged() event handler, as MapView should manage
it (no changes from elsewhere are expected)
Configurable attribute for dyn. marker colors (p3)

- HTML Select control for selection of AXF result attributes (conf,
p_Indoor, p_Mob)
- SettingsView renders list of options using a template
- MapView listens to changes to the attribute and updates markers when
necessary
- LegendView updates when attribute or color scale change
Adjust case to match model attribute name