Allow libportablethemeengine error handler output to be turned off via boolean in the library, as well as allowing the calling app have it open an output window for use outside Visual Studio or other debuggers, and offer a slimmer build lacking full output and the output window.

[DrewNaylor]

This all could eventually allow an "SDK" to be shipped in the future that allows developers (and even end users, if they're doing custom themes) to more easily create their own themes and test them, as well as add support for the theme engine to their own programs (but that would be done with a real development environment, so my thing might not be considered a real SDK, but it would be cool if it turned out to be that).

Edit: the output window would have buttons to save and clear the text, in case they need to easily store it for later or there's too much on the screen and it's confusing them. Undo would be required, too, in case they mis-click the clear button.