Inserting current date and time in one step

Here is another simple feature that may come in handy.

With the change I just checked into ooo-build master, you can now insert current date and time with just one key stroke. By default, Ctrl+; (semicolon) is bound to current date, while Ctrl+Shift+; is bound to current time. But these key bindings are configurable in case you don’t like these default bindings.