WIP Generic data handling and caching

Add basic support for reimbursements via new, generic data handling
functions.

app/routes/budget.js

@@ -1,4 +1,19 @@
 import Route from '@ember/routing/route';
+import { inject as service } from '@ember/service';
 
 export default class BudgetRoute extends Route {
+
+  @service browserCache;
+  @service kredits;
+
+  async model () {
+    const numCachedReimbursements = await this.browserCache.reimbursements.length();
+    if (numCachedReimbursements > 0) {
+      await this.kredits.loadObjectsFromCache('Reimbursement');
+      this.kredits.set('reimbursementsNeedSync', true);
+    } else {
+      await this.kredits.fetchObjects('Reimbursement', { page: { size: 10 } });
+    }
+  }
+
 }