Implement custom route for data request to prevent partial rendering of the page and it's possible issues (f.e. form captcha changes) (Close #49).

composer.json

@@ -22,7 +22,7 @@
     "source": "https://github.com/netzmacht/contao-leaflet-maps"
   },
   "require": {
-    "php": ">=7.0",
+    "php": ">=7.1",
     "ext-json": "*",
     "ext-pdo": "*",
     "contao/core-bundle": "~4.4",
@@ -39,6 +39,7 @@
     "netzmacht/php-javascript-builder": "^1.0",
     "netzmacht/php-leaflet": "^1.0.2",
     "netzmacht/contao-toolkit": "~3.0",
+    "netzmacht/contao-page-context": "~1.0",
     "contao-community-alliance/meta-palettes": "^2.0 || ^1.5",
     "menatwork/contao-multicolumnwizard": "^3.2",
     "doctrine/cache": "^1.0"