Clean up style and rename local variables in sessions views
Rename some functions for session-related view endpoints
Clean up style and reorganize some HTML in session list template

This reorganizes
Clean misc. style
Access collection objects through model
Remove unnecessary and incorrect use of access control
Move APIv2 code for deleting a view into its own class

The actual HTTP DELETE endpoint for a view is not implemented yet.
Remvoe obsolete code for Session access control
Merge branch 'cleanup'

* cleanup:
  Remvoe obsolete code for Session access control
  Move APIv2 code for deleting a view into its own class
  Remove unnecessary and incorrect use of access control
  Access collection objects through model
  Clean misc. style
  Clean up style and reorganize some HTML in session list template
  Rename some functions for session-related view endpoints
  Clean up style and rename local variables in sessions views