[BUG #8690] Removed outdated feed reader
[BUG #8690] Removed outdated playground
[BUG #8690] Removed outdated todo demo
[BUG #8690] Removed outdated api viewer
[BUG #8690] Removed outdated inspector
[BUG #8690] Removed outdated skeletons
[BUG #8690] Removed outdated emitter library
[BUG #8690] Removed outdated tutorials