use modern (2018) pattern for modules

src/browser/header/subject/mod.rs

@@ -1,46 +0,0 @@
-mod description;
-mod title;
-
-use description::Description;
-use title::Title;
-
-use gtk::{glib::GString, prelude::BoxExt, Align, Box, Orientation};
-
-pub struct Subject {
-    widget: Box,
-    title: Title,
-    description: Description,
-}
-
-impl Subject {
-    // Construct
-    pub fn new() -> Self {
-        let title = Title::new();
-        let description = Description::new();
-
-        let widget = Box::builder()
-            .orientation(Orientation::Vertical)
-            .valign(Align::Center)
-            .build();
-
-        widget.append(title.widget());
-        widget.append(description.widget());
-
-        Self {
-            widget,
-            title,
-            description,
-        }
-    }
-
-    // Actions
-    pub fn update(&self, title: Option<GString>, description: Option<GString>) {
-        self.title.update(title);
-        self.description.update(description);
-    }
-
-    // Getters
-    pub fn widget(&self) -> &Box {
-        &self.widget
-    }
-}