QKit 0.12.0

* Added componentDestruction() signal.
* Changed QKitDragAreaSingletouch item - QKit.Set container is used.
* Changed QKitItemStack item - QKit.Vector container is used.
* Changed QKitLogController item - added destructionLogging property.
* Added QKit.js script - main QKit library header file.
* Added QKitCore.js script - QKit library core.
* Added QKitObject.js script - QKit library core.
* Added QKitObject.js - description of QKit.Object class.
* Added QKitLinkedList.js - description of QKit.LinkedList class.
* Added QKitList.js - description of QKit.List class.
* Added QKitMap.js - description of QKit.Map class.
* Added QKitMultiMap.js - description of QKit.MultiMap class.
* Added QKitSet.js - description of QKit.Set class.
* Added QKitVector.js - description of QKit.Vector class.