DatabaseUpdateData.php: add missed 'on the fly' update for Form.title, changed in FormEditor.sql in 18.8.1

B6560 / Copy to clipboard: a) missing 'AS _yank', b) single and double ticks are not handled correctly

Download/Excel: Add special column name '_XLSb' and Excel column type 'b' (Base64 encode). Newline in text is correct handled with this option.

AbstractException.php: fixed problem with htmlEntities() on link to 'Edit Form' and 'Edit FormElement'.

Feature #4432 - Form Submit Log, as a new FormSubmitLog QFQ-Form, with code in the manual for a FE page to browse the table.
Also added code in the manual for a MailLog FE page.