TYPO3 Core

1. If server-based cleaning on paste is configured, keyboard input must be inhibited during the processing of the request.
2. Opera nevers triggers the copy, cut and paste events. Cleaning on cut or paste, and copy-pasting of groups of cell must be supported when the hot keys are used. Register listeners for these hot keys even when the buttons are not in the toolbar.
3. Add oncut listeners for all other browsers for cleaning garbage of varying sort left over by browsers.

(issue imported from #M14066)