Improve the entire icon logic

- Tree Shaking for Icons (Closes #53)
- New API for the config (See 
https://github.com/uwap/mqtt-control-map/wiki/Icons)
- Icons can now be colored everywhere, not just on the map

src/config/flowtypes.js

@@ -100,7 +100,6 @@ export type Control = {
   name: string,
   position: [number, number],
   icon: Icon,
-  iconColor?: (state: State) => Color,
   ui: Array<ControlUI>
 };
 export type Controls = Map<string, Control>;