[BUG #6968] migrated maining #-hints in framework
[BUG #6968] add deprecation warning for '@lint ignoreUndefined'
[BUG #6968] migrated remaining #-hints in Playground
[BUG #6968] migrated remaining #-hints in Demobrowser
[BUG #6968] migrated remaining #-hints in Tutorial
[BUG #6968] migrated remaining #-hints in FCE
[BUG #6968] migrated remaining #-hints in Feedreader
[BUG #6968] migrated remaining #-hints in Github app
[BUG #6968] migrated remaining #-hints in MobileShowcase
[BUG #6968] migrated remaining #-hints in Showcase
[BUG #6968] migrated remaining #-hints in Tutorial app
[BUG #6968] migrated remaining #-hints in WidgetBrowser
[BUG #6968] minor fix
[BUG #6968] added a comment syntax for @-hints

- adding another '@' in front of the @-hint comments it out,
  e.g. "@@ignore(foo.bar)"
- this is interesting e.g. for our skeletons that provide "@asset" hints for
  users to customize, although the vanilla skeleton has no resources
[BUG #6968] migrated remaining #-hints in Apiviewer
[BUG #6968] migrated remaining #-hints in Inspector
[BUG #6968] migrated remaining #-hints in DataDemo
[BUG #6968] migrated remaining #-hints in LogView
[BUG #6968] migrated remaining #-hints in Simulator
[BUG #6968] migrated remaining #-hints in skeletons