Add VBScript support to license checker

Accept single quote comments as they are used in VBScript

Change-Id: I1d386b7eedca021988b1df3048b05fb86aa6ceb9
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>