Implement spatial quad tree for making first selection of reachable stops

Instead of manual search:

planner.js/src/planner/stops/ReachableStopsFinderRoadPlanner.ts

Lines 57 to 65 in 9a90b95

    
           const stopsInsideCircleArea: IStop[] = []; 
        
           for (const stop of allStops) { 
        
             const distance = Geo.getDistanceBetweenStops(sourceOrTargetStop, stop); 
        
             const duration = Units.toDuration(distance, minimumSpeed); 
        
             if (duration >= 0 && duration <= maximumDuration) { 
        
               stopsInsideCircleArea.push(stop); 
        
             } 
        
           }

This has been changed by @hdelva to using a dataset with delaunay triangulations

	const stopsInsideCircleArea: IStop[] = [];
	for (const stop of allStops) {
	const distance = Geo.getDistanceBetweenStops(sourceOrTargetStop, stop);
	const duration = Units.toDuration(distance, minimumSpeed);

	if (duration >= 0 && duration <= maximumDuration) {
	stopsInsideCircleArea.push(stop);
	}
	}