Create setupMap function in mapManager

[james-rae]

• Requires issue Create map manager submodule #14 to be completed first
• Having configuration schema finalized will be very helpful prior to starting this.
• Function name is not set in stone (yet)
• Function will take a new map and add visual things to it. See the wiki page for details
• Function will have parameters (names not official yet)
  • map, an ESRI map object
  • settings, a subsection of the config (likely from the map section) that defines what visual things the map should have
• Function should iterate over the settings and apply logic for any items present
  • as an example, if a scalebar definition was present in the settings, a scalebar should be applied to the map
  • for now, just set up the structure for iteration. implementation of specfic cases will be done in other tasks
  • rather than using a switch statement, use an object that maps settings key names to the appropriate functions.