Lot's of small improvements

UI/Base/FixedUiElement.ts

@@ -0,0 +1,16 @@
+import {UIElement} from "../UIElement";
+
+export class FixedUiElement extends UIElement {
+    private _html: string;
+
+    constructor(html: string) {
+        super(undefined);
+        this._html = html;
+    }
+
+    protected InnerRender(): string {
+        return this._html;
+    }
+
+
+}