Merge branch 'coredata' into develop

* coredata: (23 commits)
  minor fixes
  Finished Core Data migration
  Properties naming fix
  Preparing to migrate graphs
  Core Data migration almost done. Graphs not migrated yet
  Core Data migration: favorites fix
  Core Data migration...
  Core Data migration...
  Minor improvements, bug fixes, refactoring. Core Data migration...
  Core Data migration...
  Core Data migration...
  Core Data migration...
  Core Data migration...
  Core Data migration...
  Core Data migration...
  Core Data migration...
  Core Data migration & refactoring, to be continued...
  Core Data migration, continuing
  Continue Core Data migration...
  Continue Core Data migration
  ...
Completely remove old engine
bumping major version
Minor fixes
Merge branch 'develop'

* develop:
  Minor fixes
  bumping major version
  Completely remove old engine