Add BackMaseuko

- Added homepage link (disabled by default)

src/components/back-maseuko/BackMaseuko.css

@@ -0,0 +1,15 @@
+.back-maseuko {
+    display: block;
+    margin-right: 8px;
+    color: #777;
+    text-decoration: none;
+}
+
+.back-maseuko:hover {
+    color: #eee;
+}
+
+.back-maseuko:hover .back-maseuko-text {
+    color: #eee;
+    text-decoration: underline;
+}

src/components/back-maseuko/BackMaseuko.js

@@ -0,0 +1,10 @@
+import './BackMaseuko.css'
+
+export default function BackMaseuko() {
+    return (
+        <a className="back-maseuko" href="/">
+            {"\u2190\u00A0"}
+            <span className="back-maseuko-text">Back to maseuko.pl</span>
+        </a>
+    );
+}

src/components/toolbar/Toolbar.js

@@ -2,10 +2,12 @@ import './Toolbar.css';
 import LoadingIndicator from './LoadingIndicator';
 import CustomFileSelect from './CustomFileSelect';
 import SideMenuToggle from './SideMenuToggle';
+import BackMaseuko from '../back-maseuko/BackMaseuko';
 import SceneryList from './SceneryList';
 import ElectrificationStepMode from './ElectrificationStepMode';
 import ThemeToggle from './ThemeToggle';
 import { useEmbeddedContext } from '../../contexts/EmbeddedContext';
+import Constants from '../../helpers/constants';
 
 export default function Toolbar() {
     const { isEmbedded } = useEmbeddedContext();
@@ -13,6 +15,7 @@ export default function Toolbar() {
     return (
         <div className='toolbar-cont'>
             {!isEmbedded && <div className='toolbar'>
+                { Constants.showBackMaseuko && <BackMaseuko /> }
                 <SceneryList />
                 or
                 <CustomFileSelect />

src/helpers/constants.js

@@ -1,5 +1,6 @@
 const Constants = {
     buildVersion: '1.7.1',
+    showBackMaseuko: false,
     map: {
         zoomSensitivity: 0.002,
         zoomMin: 0.03,