Navigation palette: thumbnails isn't refeshed after application added to the page

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

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.).

toolBar size depends on zoom.
audio items has title and borders.

Audio items cannot be resized in vertical dimension because there are no useful content.

Audio and Video items has minimal dimensions.

- 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.

Frame buttons