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, cleanin dom|
|focus||moves focus to the clipboard buffer|
|init||inits clipboard buffer|
|set||sets new value for clipboard buffer|