Layers can say which controls they want to add to the map.
Renamed layers/data to layers/Data.
Added layers-style config to warrnambool-concrete (this is an empty marker commit).
Split Vicmaps layers. Processing 'layers'-style config to build layer list.
Add jsonpath.
Works, with most non-layers config removed (still need to fix syncher).
Works without non-layers style config (for warrnambool-concrete).
Switched everything to new config layout and consolidated vector layers.
Added checks that the Bing API key is specified in config, when needed.