GTK4 changes how icons are loaded - only icons that are
set up to follow icon theme paths are recolored. The way
the network panel loaded icons wasn't compatible with this,
causing icons to stay dark in dark mode.
This commit adjusts the gresource so that icons are
in `$RESOURCE_BASE_PATH/icons/scalable/actions`. Since
GTK knows how to handle that automatically, we can
simply use `icon-name` instead of loading a full
icon path.
This commit renames {network|wifi}.ui to cc-{network|wifi}-pane.ui,
in order to match the corresponding C files. This introduces no
functional changes.
The glory moment has come. The new Wi-Fi panel is finally
introduced using a different code style from the rest of
the Network panel, since Control Center itself is written
using the GTK+ C code style.
The Wi-Fi panel uses modern GTK+ features like template
classes and new widgets. The files are stored together
with the Network panel so that we can reuse the abstraction
layer that the Network panel has to manage devices.
https://bugzilla.gnome.org/show_bug.cgi?id=784818
