Broke up UI into seperate file, reorganisation of dirtree, added ViewStack

data/resources/ui/window.blp

@@ -0,0 +1,66 @@
+using Gtk 4.0;
+using Adw 1;
+
+template $GnomeframeWindow: Adw.ApplicationWindow {
+  default-width: 800;
+  default-height: 600;
+  title: "Gnomeframe";
+
+  content:
+    // Scaffolding
+    Adw.ToolbarView {
+      // Header bar
+      [top]
+      Adw.HeaderBar {
+        [start]
+        Button btn_save_as {
+          tooltip-text: _("Save as…");
+          icon-name: "floppy-symbolic";
+        }
+        [end]
+        MenuButton {
+          icon-name: "open-menu-symbolic";
+          menu-model: primary_menu;
+          tooltip-text: _("Main Menu");
+          primary: true;
+        }
+        title-widget:
+          Adw.ViewSwitcher {
+            policy: wide;
+            stack: viewstack;
+              };
+      }
+      // Main View
+      content:
+        Adw.ViewStack viewstack {
+
+        };
+      [bottom]
+      Adw.ViewSwitcherBar switcher_bar {
+        stack: viewstack;
+      }
+    };
+}
+menu primary_menu {
+  section {
+    item {
+      label: _("_Preferences");
+      action: "app.preferences";
+    }
+
+    item {
+      label: _("_Keyboard Shortcuts");
+      action: "win.show-help-overlay";
+    }
+
+    item {
+      label: _("_Help");
+      action: "app.help";
+    }
+
+    item {
+      label: _("_About Gnomeframe");
+      action: "app.about";
+    }
+  }
+}