Ensure all assets are handled by webpack

Author: dkastl

src/styles/icons/custom/custom-icons-def.ts

@@ -1,5 +1,6 @@
 import * as FontFaceObserver from 'fontfaceobserver';
 import FontSymbol from 'ol-ext/style/FontSymbol';
+import './custom-icons.woff2';
 
 const iconMappings: { [key: string]: any } = {
   'lobsta': '\uf101',

src/styles/index.ts

@@ -19,3 +19,6 @@ import '@mdi/font/css/materialdesignicons.css';
 
 // Import Material Design icons definition JS file to define icon names and variations
 import './icons/material-design/material-design-def';
+
+// Import plugin SVG icons to make them available in assets/images
+import './images/icons.svg';