[06/18] comctl32: TaskDialog - Implement main and content text controls

[Fabian Maurer]

> Right now passing something that is not a string crashes the dialog, which
> probably should not happen. To get the string if a resource ID has been
> passed you can use something like
Thanks, probably should have added this already, or at least note it.
It was on my todo for a while, then I decided to first get the dialog working 
properly.

I wanted to get a simple implementation in first, I'm still missing a lot of 
important features, but it should be a good enough replacement for the 
solution we currently have.
Should I add this feature into this patchset, or is it ok if I add it once I 
got this upstream?

Regards,
Fabian Maurer