QxDragAndDropManager: Moved cursor creation to seperate init method to prevent premature creation of widgets

QxCommand: Fixed commands for empty shortcut

QxLabel: Added text-align support

QxTree: Added support for user-defined tree icons

QxRangeManager: Added step property

Minor changes: QxIframe, QxApplication

Fixed some images

Added scroller_olsson, splitpane_olsson

Fixed doctype to create IE valid pages

Minor fixes for build scripts

Fixed dependency entries