code improvements (#1423)

* removed unused mapping information
* added support for further field types
* fixed changing date objects for begin and end
* added more project fields as invoice variables
* theme update and asset rebuild

composer.json

@@ -24,7 +24,7 @@
         "gedmo/doctrine-extensions": "^2.4",
         "jms/metadata": "^2.0",
         "jms/serializer-bundle": "^3.2",
-        "kevinpapst/adminlte-bundle": "~3.0",
+        "kevinpapst/adminlte-bundle": "^3.0",
         "kimai/kimai2-composer": "^0.1",
         "laravolt/avatar": "^3.0",
         "league/csv": "^9.4",