feat: excel import (#527)

* refactor: simplify excel import

* chore: add external deepmerge utility

* chore: create import map utilities

* chore: increase size limits on uploads

* style: small presentation tweaks

* feat: resolve times on excel import, refs #508

apps/server/package.json

@@ -15,7 +15,7 @@
     "lowdb": "^5.0.5",
     "multer": "^1.4.5-lts.1",
     "node-osc": "^9.0.2",
-    "node-xlsx": "^0.21.0",
+    "node-xlsx": "^0.23.0",
     "ontime-utils": "workspace:*",
     "passport": "^0.6.0",
     "passport-local": "~1.0.0",