Added pages to Window/GraphicsItem: only items on current page are visible.
Reordered constants in DefaultCheckBoxStyle
Renamed check box images.
Improved and added antique DefaultCheckBoxStyles.
Added possibility to hide displayed text to InputField (e.g. passwords).
Deprecated TurnEvent and TurnListener.
Suppressing unchecked warning in Data class.
Refactored event system: Global an local (per window) event queue(s) now in core.