Merge branch 'new-phoenix' into 'master'

try new phoenix

See merge request gridtracker.org/gridtracker!290

If this is changing anything in the UI or operational behavior, please prepare to update the wiki!

package.json

@@ -7,7 +7,7 @@
     "eslint-plugin-import": "^2.22.1",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-promise": "^4.2.1",
-    "@gridtracker.org/nwjs-builder-phoenix": "^1.15.1"
+    "@gridtracker.org/nwjs-builder-phoenix": "^1.15.3"
   },
   "scripts": {
     "test": "eslint package.nw",