Model naming cleanup

[krzys-h]

I'm starting to get mad because of some bad naming conventions

• Rename WorkshopUserProfile -> CampParticipant (so that it matches the naming convention of WorkshopParticipant)
  • Rename related name UserProfile.workshop_profile -> UserProfile.camp_participation
  • Rename related name Camp.workshopuserprofile_set -> Camp.participants
  • Add unique_together
• Cleanup WorkshopParticipant
  • Rename WorkshopParticipant.participant to WorkshopParticipant.user_profile (to match CampParticipant, and because seeing workshop_participant.participant is confusing)
  • Rename related name Workshop.workshopparticipant_set -> Workshop.participants
  • Note: Workshop.participants now points to WorkshopParticipant object, rather than UserProfile, because it appears this is more often what we want
  • Rename related name UserProfile.workshopparticipant_set -> UserProfile.workshop_participation
• Cleanup Article
  • Rename related name Article.articlecontenthistory_set -> Article.content_history
  • And remove a method which implemented it manually...
  • Remove related name User.articlecontenthistory_set (from ArticleContentHistory.modified_by)
  • Remove related name User.article_set (from Article.modified_by)
• Rename related name User.userprofile to User.user_profile to match the convention used everywhere else

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This change is 

[codecov[bot]]

Codecov Report

Merging #571 (de0947f) into master (a183c6e) will increase coverage by 0.18%. The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master     #571      +/-   ##
==========================================
+ Coverage   85.25%   85.44%   +0.18%     
==========================================
  Files          15       15              
  Lines        2327     2329       +2     
==========================================
+ Hits         1984     1990       +6     
+ Misses        343      339       -4     

Impacted Files	Coverage Δ
wwwapp/forms.py	96.07% <ø> (ø)
wwwapp/mail_views.py	47.69% <50.00%> (ø)
wwwapp/models.py	83.33% <83.87%> (+1.04%)	:arrow_up:
wwwapp/views.py	81.24% <91.11%> (+0.05%)	:arrow_up:
wwwapp/admin.py	83.73% <100.00%> (ø)
...app/management/commands/populate_with_test_data.py	96.82% <100.00%> (ø)

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