Add code to try and make sure second votable track is different from first. Implement code to handle skip requests in player.

src/GroovePlayer.h

@@ -25,6 +25,7 @@
 #include <Wt/Dbo/FixedSqlConnectionPool>
 #include <list>
 #include <thread>
+#include <chrono>
 #include "db/User.h"
 #include "db/AudioTrack.h"
 #include <groove/groove.h>
@@ -51,6 +52,8 @@ public:
     std::list<AudioTrack> currentVoteBatch;
     std::list<std::pair<AudioTrack, int>> currentVoteStatus;
     bool voteEndedButNotNextTrackYet = false;
+    std::list<User> currentSkipRequester;
+    std::chrono::steady_clock::time_point skipRequestedAt;
     
     enum ScanResults {ACCEPTED = true, MISSING_ARTIST_TAG = false, MISSING_ALBUM_TAG = false, MISSING_TITLE_TAG = false, MISSING_GENRE_TAG = false, DUPLICATE_TRACK = false, MISSING_COVERART_TAG = false, MISSING_MULTIPLE_TAGS = false};
     ScanResults addFileToTrackDBIfTagged(Wt::Dbo::Session* session, std::filesystem::path file);
@@ -61,6 +64,8 @@ public:
         User userInvolved;
         std::list<AudioTrack> tracksInvolved;
     };
+    std::list<AudioTrack> requestQueue;
+    std::list<PlayerEvent> lastInternalEvents;
 private:
     GroovePlayerMgr (std::string dbFile);
     ~GroovePlayerMgr();
@@ -68,9 +73,6 @@ private:
     Wt::Dbo::FixedSqlConnectionPool* connectionPool;
     bool continueEventLoop = true;
     
-    std::list<AudioTrack> requestQueue;
-    std::list<PlayerEvent> lastInternalEvents;
-    
     std::thread* grooveEvents;
     void grooveEventLoop();
     std::list<AudioTrack> getNextVoteBatch(Wt::Dbo::Session* session);