* refactors majority of user views into class based views
* introduces BaseModalFormView and BaseView for even more generic usage
* renames url identifier user:index into user:detail for more clarity
* adds public report rendering for intervention model
* adds new routes for report
* adds new public_base.html and public_navbar.html
* adds lookup table for zoom levels for lanis link generating
* moves qr code generating into utils/generators.py