Simplify and merge StagingFile and StagingFolder classes
Remove unused feature of the Link class
Reorganize functions and merge with Link class
Update bind_links to Link.bind_links, sort imports by alphabetical order
Remove custom URL to view name resolver and use the one provided by Django
Merge remaining navigation util functions into the Link class
Remove usage of list_object_variable_name and of navigation_object_name, implement use of resolved_object in links
Use proper method to determine if an index or a template node are root nodes elements
Remove further uses of navigation_object_name and increase use of resolved_object
Eliminate use of navigation_object_name from the metadata app
Remove remaining uses of navigation_object_name
Remove remaining usage of list_object_variable_name
Remove unused custom template tag variable_tags
Remove remaining code relating to navigation_object_name and list_object_navigation_name as well as some vestigial navigation code
Speed up document page view rendering by not fetching the parent document version