HexEditor: Construct user interface from GML

Userland/Applications/HexEditor/HexEditorWindow.gml

@@ -0,0 +1,25 @@
+@GUI::Widget {
+    name: "main"
+    fill_with_background_color: true
+
+    layout: @GUI::VerticalBoxLayout {
+        spacing: 2
+    }
+
+    @GUI::ToolbarContainer {
+        name: "toolbar_container"
+
+        @GUI::Toolbar {
+            name: "toolbar"
+        }
+    }
+
+    @HexEditor::HexEditor {
+        name: "editor"
+    }
+
+    @GUI::Statusbar {
+        name: "statusbar"
+        label_count: 5
+    }
+}