Supercedes https://github.com/openSUSE/osem/pull/2031 .
Note:
* "Questions" modals have been dropped from this view; questions are no
longer asked on registration, since Surveys(PR#1100) were added.
Make the message in admin/Tracks form more visible by making it bold and
adding links to venue and rooms
Make papertrail track changes for all the track's attributes
Add validation to require presence of description for self-organized
tracks
Add ID column to admin/Tracks#index
Make the cfp inclusion column sortable
Show success/error flash messages after toggling cfp inclusion
Sets up paper_trail tracking in important models
and add conference_id to versions for storing conference_id
of conference related objects as metadata.This will help in querying
for versions related to conferences.
Fix issues with factories & event types initialization.Import paper_trail testing helpers
Fix bug: Creating an event creates a useless version with event update
Add revert and view changes features to revision history
* Consistent route/model/controller/view layout
* Get rid of unused photos, speakers, dietchoices, social_events controllers
* Drop unused :public from Rooms and :description from CallForPapers
* Cleanup the CSS
* Fix more views then you have fingers and toes
* Introduce position(weight) for sponsor levels
* Fix bootstrap/datatable integration
