Add code to add track to DB and remove old ones that are gone. Added fingerprint lib to link for id-ing tracks. Make sure DB is logical after these changes. Change music path due to complaints I don't quite understand.

src/GroovePlayer.h

@@ -26,6 +26,7 @@
 #include <thread>
 #include "db/User.h"
 #include "db/AudioTrack.h"
+#include <groove/groove.h>
 #include <experimental/filesystem> //TODO:Change to non-gcc way when officially using c++17
 namespace std {
     namespace filesystem =  experimental::filesystem;
@@ -37,7 +38,7 @@ public:
     static std::filesystem::path musicScanDir;
     static GroovePlayer* getInstance() {
         static GroovePlayer instance("music.db");
-        musicScanDir = std::filesystem::current_path().string()+"/music";
+        musicScanDir = std::filesystem::path("music");
         return &instance;
     };
     GroovePlayer(GroovePlayer const&) = delete;
@@ -54,6 +55,7 @@ private:
     std::thread* grooveAudioScanner;
     static void grooveAudioScannerLoop();
     static bool addFileToTrackDBIfTagged(std::filesystem::path file);
+    static void removeOrphanedTracks();
     
 };