Wt

There's still a lot of CMake in the Wt source code that could do with some cleaning up. There are also likely still some parts using custom Find... scripts that don't need it anymore.

It would also be nice if we could make all of the examples work standalone.'

We can also show a table at the end of configuration listing all of the features that were enabled/disabled and why (dependency not found, explicitly disabled, unavailable on this platform,...).