Move functionality to using new model

[pdmnyberg]

The following feature need to support the new model:

• [x] Report / metrics pages
• [x] Upload, bulk and event specific
• [ ] Event edit view and event stats (allow deletion of uploaded metrics and show of quick upload status)

We also need to:

• [ ] Create a migration path from the old model to the new model

[pdmnyberg]

When it comes to migration path to the new model I have an idea that is as follows:

• Add system settings on a core, node and user level to allow enabling of new features for specific people
• Add an admin action that can migrate specific events to the new model
  • The action should migrate data if the event is locked and the event have not been migrated previously

Doing it this way could allow us to test the features in a production like environment without affecting users.