Add interface class to represent player interface. Have simple hide/show animation between. Put up more interface elements on login interface to show inteded ui.

src/WebInterface.h

@@ -27,6 +27,7 @@ class WebInterface : public Wt::WApplication
 {
 public:
     WebInterface(const Wt::WEnvironment& env);
+    ~WebInterface();
     void loginCompleted();
 private:
     struct internal;