Linking #4932

The VBE accepts ? and "pretty-prints" it to a Print statement - which works fine when the ? token follows Debug., but makes the statement illegal otherwise.

Let's implement an autocompletion feature that intercepts the keypress when the current logical line of code is empty (barring indentation), and writes Debug.Print instead, placing the caret immediately after the Print token (we can't make it have a trailing whitespace, VBE would eat it).