Refactor pages into separate files

examples/cosmic/src/window/bluetooth.rs

@@ -0,0 +1,24 @@
+use cosmic::{
+    Element,
+    iced::widget::{column, text, toggler},
+    widget::{list_column, settings},
+};
+use super::{Message, Page, Window};
+
+impl Window {
+    pub(super) fn view_bluetooth(&self) -> Element<Message> {
+        settings::view_column(vec![
+            self.page_title(Page::Bluetooth),
+
+            column!(
+                list_column()
+                    .add(settings::item("Bluetooth", toggler(None, self.toggler_value, Message::TogglerToggled))),
+                text("Now visible as \"TODO\", just kidding")
+            ).spacing(8).into(),
+
+            settings::view_section("Devices")
+                .add(settings::item("No devices found", text("")))
+                .into()
+        ]).into()
+    }
+}