Update the gtk libraries to 0.17

[ettancos]

Updated the gtk related libraries to ~v0.17

This opens the path to use the updated layer-shell protocol to be able to specify keyboard interactivity to be exclusive or on-demand allowing different use-cases on wayland.

Notable changes:

• v3_22 api is now default
• glib &Self::Type parameters got removed, object is now in self.obj()
• glib properties moved to Builders instead of using ::new which is now deprecated, I've used the added helper macros to derive them
• window::set_wmclass has been removed, according to the docs its redundant so I just removed it

tested on wayland

Maybe some feedback from X users would be welcome just in case.

[VuiMuich]

So far running well on X11 for me.

[elkowar]

This looks really good! Sorry for the long wait ._.

The only thing I'm not super happy with is removing the wm-class -- while GTK docs rightfully say that it's not a good idea to screw with it in regular applications, for eww (where every widget might "mean" something completely different, even though it's the same application) it does provide lots of value to have each widget be clearly identifiable by the WM and related tooling through the WM class