Add the possibility to load a custom layout with base64-encoded jsons

UI/Img.ts

@@ -1,4 +1,19 @@
 export class Img {
+
+    /**
+     * If the source is an svg element, it is returned as is.
+     * If not, the source is wrapped into a 'img'-tag
+     * @param source
+     * @constructor
+     */
+    static AsImageElement(source: string): string{
+        if(source.startsWith("<svg")){
+            return `<img src="data:image/svg+xml;base64,${(btoa(source))}">`;
+        }else{
+            return `<img src="${source}">`
+        }
+    }
+    
     static readonly checkmark = `<svg width="26" height="18" viewBox="0 0 26 18" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M3 7.28571L10.8261 15L23 3" stroke="black" stroke-width="4" stroke-linejoin="round"/></svg>`;
     static readonly no_checkmark = `<svg width="26" height="18" viewBox="0 0 26 18" fill="none" xmlns="http://www.w3.org/2000/svg"></svg>`;