use canonical module subfolder tree

src/browser/main/tab/label/mod.rs

@@ -0,0 +1,16 @@
+mod pin;
+mod title;
+
+use gtk::prelude::BoxExt;
+use gtk::Box;
+
+pub fn new() -> Box {
+    let label = Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .build();
+
+    label.append(&pin::new(false));
+    label.append(&title::new());
+
+    label
+}