Media control improved.
Code was cleaned.

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.

Locked items cannot be moved horizontally by its frame.

Text items can be resized correctly now.

Frame buttons

Added new system util method: deleteFile.