Add trivialwizard6

[rcalixte]

This uses Qt6 QWizardPage instances to create a sample introductory wizard for an application.

This is ported from:
https://github.com/jimmykuu/therecipe-qt-examples/blob/master/widgets/dialogs/trivialwizard/trivialwizard.go

[rcalixte]

Would it makes sense to move the examples to a dedicated repository and link to them from the README or as a git submodule? I want to flesh out the Qt6 examples so I expect to contribute more of them but it might also help other developers onboard with this toolkit.

[mappu]

Nice, the example looks great.

Would it makes sense to move the examples to a dedicated repository and link to them from the README or as a git submodule?

I'm happy either way.

• One reason to keep some examples in this repo is so that CI can compile them, to avoid breakage. This is especially important as MIQT is still not yet v1.0.0.
• One reason to split to another repo, is the ability to port examples with a wider variety of licenses. It's great to port from jimmykuu/therecipe-qt-examples, but because code in therecipe/qt is LGPL, we could only port some small trivial things to avoid copyright infringement. But in a new repo with a different license, that would definitely not be a problem.

[mappu]

Test screenshot