FIX gamification into current master state

.gitignore

Gemfile

app/controllers/application_controller.rb

app/controllers/concerns/items_filter.rb

app/controllers/v1/achievements_controller.rb

app/controllers/v1/action_counters_controller.rb

app/controllers/v1/actions_controller.rb

app/controllers/v1/items_controller.rb

app/controllers/v1/progresses_controller.rb

app/controllers/v1/requirements_controller.rb

app/controllers/v1/unlocked_achievements_controller.rb

app/controllers/v1/user_items_controller.rb

app/controllers/v1/users_controller.rb

app/models/achievement.rb

app/models/action.rb

app/models/action_counter.rb

app/models/collection.rb

app/models/collection_item.rb

app/models/concerns/trackable.rb

app/models/download.rb