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.

Fixed restoring of cursors at mouse release event on board.

It's icon is temporary.

Behavior implemented:
1. Can interact with all items without showing items frames (but ToolBar shows).
2. Cannot move items, but can drag images.
3. Selected items appears deselected when Play tool chosen.
4. Play tool don't requires selecting of item before interacts.
5. Cursor looks like tool icon in text and image widgets (should be the same in any others widgets, but now in w3c is not).

Fixed pages shuffling.
Fixed refreshing thumbnail of new added page.
Some code refactoring and optimizations.

Frame buttons