Refactoring of GPS-location (uses featureSource too now), factoring out state, add ReplaceGeometryAction and conflation example

UI/Base/AsyncLazy.ts

@@ -0,0 +1,28 @@
+import BaseUIElement from "../BaseUIElement";
+import {VariableUiElement} from "./VariableUIElement";
+import {UIEventSource} from "../../Logic/UIEventSource";
+import Loading from "./Loading";
+
+export default class AsyncLazy extends BaseUIElement{
+    private readonly _f: () => Promise<BaseUIElement>;
+    
+    constructor(f: () => Promise<BaseUIElement>) {
+        super();
+        this._f = f;
+    }
+    
+    protected InnerConstructElement(): HTMLElement {
+        // The caching of the BaseUIElement will guarantee that _f will only be called once
+        
+        return new VariableUiElement(
+            UIEventSource.FromPromise(this._f()).map(el => {
+                if(el === undefined){
+                    return new Loading()
+                }
+                return el
+            })
+            
+        ).ConstructElement()
+    }
+    
+}

UI/Base/Minimap.ts

@@ -19,6 +19,7 @@ export interface MinimapOptions {
 export interface MinimapObj {
     readonly leafletMap: UIEventSource<any>, 
     installBounds(factor: number | BBox, showRange?: boolean) : void
+    TakeScreenshot(): Promise<any>;
 }
 
 export default class Minimap {

UI/Base/MinimapImplementation.ts

@@ -9,6 +9,7 @@ import {Map} from "leaflet";
 import Minimap, {MinimapObj, MinimapOptions} from "./Minimap";
 import {BBox} from "../../Logic/BBox";
 import 'leaflet-polylineoffset'
+import {SimpleMapScreenshoter} from "leaflet-simple-map-screenshoter";
 
 export default class MinimapImplementation extends BaseUIElement implements MinimapObj {
     private static _nextId = 0;
@@ -278,4 +279,10 @@ export default class MinimapImplementation extends BaseUIElement implements Mini
 
         this.leafletMap.setData(map)
     }
+    
+    public async TakeScreenshot(){
+        const screenshotter = new SimpleMapScreenshoter();
+        screenshotter.addTo(this.leafletMap.data);
+        return await screenshotter.takeScreen('image')
+    }
 }