Added extras menu, stubbed map editor, made asset viewer and map editor accessible from extras menu

lib/ui/menus/extras_menu.rb

@@ -0,0 +1,20 @@
+class IMICFPS
+  class ExtrasMenu < Menu
+    def setup
+      title "I-MIC FPS"
+      subtitle "Extras"
+
+      link "Asset Viewer" do
+        push_state(IMICFPS::AssetViewerTool::MainMenu)
+      end
+
+      link "Map Editor" do
+        push_state(IMICFPS::MapEditorTool::MainMenu)
+      end
+
+      link "Back" do
+        pop_state
+      end
+    end
+  end
+end