Removed memory leak.

Improved recognition of song's title.
Some code removed from header.

UBToolWidget.cpp/.h cleaned too.

Import PDF: progress bar is not visible

Now coping creates a full copy of already created item. Copy has it's own content (like video, audio or folder) and stores original item properties (like locked, pos, size, freezed e.t.c.).

Trying to position ToolWidget at the right place to move naturally from widgetitem to toolidget.