This could happen if a child was added to a GTabWidget before the
GTabWidget had its first layout.
Also add an assertion to catch this in GWidget::set_relative_rect()
since it was not immediately obvious what was happening.
`GTabWidget` now allows the user/caller to get the currently active
tab widget, meaning that actions that are applied globally (such as
an 'Apply' or 'OK' button) can now react to specific tabs etc.
An interactive application to modify the current display settings, such as
the current wallpaper as well as the screen resolution. Currently we're
adding the resolutions ourselves, because there's currently no way to
detect was resolutions the current display adapter supports (or at least
I can't see one... Maybe VBE does and I'm stupid). It even comes with
a very nice template'd `ItemList` that can support a vector of any type,
which makes life much simpler.
Instead of LibGUI and WindowServer building their own copies of the drawing
and graphics code, let's it in a separate LibDraw library.
This avoids building the code twice, and will encourage better separation
of concerns. :^)
