Remove Legacy Code

[mrwunderbar666]

• [ ] All routes that do not belong to api
• [ ] All templates
• [ ] Refactor some dgraph.py functions and tidy up
• [ ] All Form generating features in the DGraph abstraction
• [ ] Flask-Login dependency
  • [ ] Remove all references to Flask Login
  • [ ] Re-Implement the UserMixin AnonymousUser and AnonymousUserMixin classes
  • [ ] Should also have an is_authenticated property (would likely be convenient
• [ ] Flask-Markdown dependency
• [ ] dgraph_types.py has plenty of WTF generating stuff, needs to go (e.g. choices_tuples)
• [ ] Rename Exceptions (InventoryValidationError -> ValidationError, etc)