change whole backend and tables for gorm table references

simplify tables with table components close #31

src/vueLib/tables/attendees/AttendeesTable.vue

@@ -73,7 +73,7 @@
       <q-td v-if="props.col.field === 'attendees'" :props="props">
         <q-btn v-if="props.value !== null && props.value.length > 0" dense flat icon="people"
           ><q-badge color="primary" text-color="primary-text" floating transparent>{{
-            props.row.count
+            props.row.attendees.length
           }}</q-badge></q-btn
         >
       </q-td>