Transparent drawing view is separated as DesktopView and doesn't manages strokes selections and movements.

Fixed some related issues.

 Draw lines and move

PlayTool -> SelectTool
SelectTool -> PlayTool
EraiserTool -> shows EraserPalette.

Items can be moved by RubberBand.

- locked items is not editable now.
- toolbar for text item hides when item is locked

Fixed behavior of toolbar:
toolbar of media items hides after 5s of idle.