Interface for clipboard.
Because browsers doesn't allow direct comunication with clipboard, lib creates hidden textarea which always hold text for copy (ctr-c) operation. So you can't set text directly to clipboard but you can place it ready for ctrl-c operation.
| destructor | destroys the clipbuffer, cleaning the DOM |
| focus | moves focus to the clipboard buffer |
| init | initializes the clipboard buffer |
| set | sets new value for clipboard buffer |