With this, it's possible to build Ladybird without having Qt installed.
(Previously, the build required `moc` to exist.)
In fact, it's possible to build Ladybird without anything off `brew`
as long as you have `ninja` and `gn` (both of which don't have any
dependencies themselves and are easy to build).
This will help a lot with developing chromes for different UI frameworks
where we can see which helper classes and processes are really using Qt
vs just using it to get at helper data.
As a bonus, remove Qt dependency from WebDriver.
Now that all the classes for Ladybird are in the Ladybird namespace, we
don't need them named as Ladybird::FooBarLadybird. For the Qt-specific
classes, we can tack on a Qt at the end for clarity, but FontPlugin and
ImageCodecPlugin no longer have anything to do with Qt.
LibTLS still can't access many parts of the web, so let's hide this
behind a flag (with all the plumbing that entails).
Hopefully this can encourage folks to improve LibTLS's algorithm support
:^).
The Qt relationship was removed in de31a8a4, so let's acknowledge that
and make it clearer to potential non-Qt ports that this file is usable
by them :^).
