use modern (2018) pattern for modules

src/browser/main/tab/page/navigation/base.rs

@@ -0,0 +1,29 @@
+use gtk::Button;
+
+pub struct Base {
+    widget: Button,
+}
+
+impl Base {
+    // Construct
+    pub fn new() -> Self {
+        Self {
+            widget: Button::builder()
+                .action_name("win.tab_page_base")
+                .icon_name("go-home-symbolic")
+                .tooltip_text("Base")
+                .sensitive(false)
+                .build(),
+        }
+    }
+
+    // Actions
+    pub fn update(&self) {
+        // @TODO
+    }
+
+    // Getters
+    pub fn widget(&self) -> &Button {
+        &self.widget
+    }
+}