Implement Gtk Network Status (#165)

Implemented
- Switch reacts to burrow socket and network changes 
- meson as build system
- Basic diagnostics to ensure burrow is installed properly
- Flatpak / Meson Building

burrow-gtk/src/components/settings_screen.rs

@@ -0,0 +1,44 @@
+use super::*;
+
+pub struct SettingsScreen {
+    _diag_group: AsyncController<settings::DiagGroup>,
+}
+
+pub struct SettingsScreenInit {
+    pub daemon_client: Arc<Mutex<Option<DaemonClient>>>,
+}
+
+#[relm4::component(pub)]
+impl SimpleComponent for SettingsScreen {
+    type Init = SettingsScreenInit;
+    type Input = ();
+    type Output = ();
+
+    view! {
+        #[name(preferences)]
+        adw::PreferencesPage {}
+    }
+
+    fn init(
+        init: Self::Init,
+        root: Self::Root,
+        sender: ComponentSender<Self>,
+    ) -> ComponentParts<Self> {
+        let diag_group = settings::DiagGroup::builder()
+            .launch(settings::DiagGroupInit {
+                daemon_client: Arc::clone(&init.daemon_client),
+            })
+            .forward(sender.input_sender(), |_| ());
+
+        let widgets = view_output!();
+        widgets.preferences.add(diag_group.widget());
+
+        let model = SettingsScreen {
+            _diag_group: diag_group,
+        };
+
+        ComponentParts { model, widgets }
+    }
+
+    fn update(&mut self, _: Self::Input, _sender: ComponentSender<Self>) {}
+}