Some warnings removed.
Fixed source url for async copyed files.

Implemented undo stack for moved unselected items.

Sankore 1224 z-layer reordering amended Delegate button progressbar added retrieving data from the internet

Import ubz works bad with groups.

Now, only one instance per scene is allowed in calling UBGraphicsCache instance() static function.

Items duplication adapted to new ideology of adding media items on the board.

Аudio widget is not update button view.

Have a problem - should take care about saving original src path.

Reworked resizing of items on board. Still have troubles with resizing at BottomRight resizer.

1st we remove original widget, then we disable undo stack, create a copy of widget and make it a tool. Then undo stack enables back. That widget has tool as parent, so we not need to manage him by scene.

The eraser erases more than it should delete

Show Desktop: "Erase all" button isn't work

Desktop mode is broken
SANKORE-633
Positioning of floating palettes inside layers .