Add image upload functionality with imgur

UI/VariableUIElement.ts

@@ -0,0 +1,17 @@
+import {UIElement} from "./UIElement";
+import {UIEventSource} from "./UIEventSource";
+
+export class VariableUiElement extends UIElement {
+    private _html: UIEventSource<string>;
+
+    constructor(html: UIEventSource<string>) {
+        super(html);
+        this._html = html;
+    }
+
+    protected InnerRender(): string {
+        return this._html.data;
+    }
+
+
+}