Implemented custom fast renderer for range circles

It's a bit hacky since I had to override a default leaflet renderer function. Works well but may be injected in a more elegant way.

client/src/map/map.ts

@@ -102,8 +102,6 @@ export class Map extends L.Map {
     constructor(ID: string){
         /* Init the leaflet map */
         super(ID, { 
-            zoomSnap: 0, 
-            zoomDelta: 0.25, 
             preferCanvas: true, 
             doubleClickZoom: false, 
             zoomControl: false,