[SDL] SetCaption and SetIcon

[Ryan C. Gordon]

> BTW: SetCaption works good, but i just don't know what happens with
> the second parameter! Yes, the first is shown as Title in the titlebar
> on top of the window. But the second??? Also, you can ALWAYS use this
> and change the caption, not only before SetVideoMode.

The second parameter is used when iconifying (minimizing) the window on
platforms that use it. It's pretty rare nowadays. Just put a more terse
version in there.

The Build Engine uses:

 "BUILD Engine by Ken Silverman" and "BUILD", respectively.

--ryan.