Added base of code to allow sending backend updates to connected clients.

src/db/UserAction.h

@@ -29,7 +29,7 @@
 class UserAction
 {
 public:
-    enum UAction {Login = 0, Logout = 1, RequestTrack = 2, VoteTrack = 3, UploadTrack = 4, RequestSkip = 5, Pause = 6};
+    enum UAction {Login = 0, Logout = 1, RequestTrack = 2, VoteTrack = 3, UploadTrack = 4, RequestSkip = 5, PlayPause = 6};
     
     Wt::Dbo::ptr<User> user;
     UAction action;