added clock, pager, and task list widgets for ref; added footer container; added option for key combo o universally toggle window with key combo if set

src/core/containers/center_container.py

@@ -26,6 +26,10 @@ class CenterContainer(Gtk.Box):
 
     def _setup_styling(self):
         self.set_orientation(Gtk.Orientation.VERTICAL)
+
+        self.set_hexpand(True)
+        self.set_vexpand(True)
+
         ctx = self.get_style_context()
         ctx.add_class("center-container")