Controllers don't have any GUI and don't depend on the frontend
technology.
Views are implemented in a specific GUI tech (QtWidgets, QtQuick, etc).
For now only QtWidgets work. There's still a lot to decouple.
This will make it easier to introduce non-Qt backends.
Our example was being built as part of KDDW, so that worked fine.
Now it can also be built with an installed KDDW.
Problem was the folder hiearchy in the installed include dir
didn't match the folder hiearchy in the source repo
Fixes#62
Github issue #56 is not a KDDW bug, it's how Qt works. QtWidgets don't
have focus scope. But let's workaround and handroll our own FocusScope.
Now the title bar can be colored differently if the dock widget it controls
contains any focused children.
This just implements half of the story. You have to focus a child
for the title bar to change color. Clicking the title bar directly
isn't done yet. Needs to be figured out. What do we focus when clicking it?
TitleBars usually don't care about keyboard focus. Probably we
just use the user's widget as a focus proxy.
