v1.6.6

1. Func library has added functions "add text item to listbox and combobox" and "delete text item from listbox and combobox".
2. Double click the zip of the backup directory directly to prompt to restore to the corresponding version.
3. Beautification of the background of the design area.
4. Fix the drag box when dragging form.
5. Add keyRelease event.

Author: honghaier-game