Refactor tagging and add library scanning

- Replace `Tag` class with utility helpers for hashing and file type parsing
- Change `Track.artwork` from `std::string` to `TagLib::VariantMap`
- Add `importArtwork`, rename `importFolder` to `scanFolder`
- Add `scanLibrary`, `updateLibrary`, `editMetadata`, and `seek` methods to `Player` hierarchy
- Remove obsolete `Tag.h`/`Tag.cpp` files

src/PlayerLocal.cpp

@@ -1,5 +1,10 @@
 #include "../include/PlayerLocal.h"
 #include "../include/Player.h"
+#include "../include/File.h"
+#include "../include/Database.h"
+#include "../include/Containers.h"
+
+using db = Database;
 
 void Player::play () { PE_.startPlayback(); }
 void Player::stop () { PE_.stopPlayback(); }
@@ -20,7 +25,7 @@ void PlayerLocal::previous() {
 ma_uint64 Player::getPlayheadPosition () { return PE_.getPosition(); };
 
 void PlayerLocal::loadFile ( Track track ) {
-    const char *fp = track.filePath;
+    const char *fp = track.filePath.c_str();
     PE_.initDecoder ( fp );
 }
 
@@ -35,3 +40,18 @@ void::PlayerLocal::playQueue() {
         ++currentTrack_;
     }
 }
+
+void PlayerLocal::scanLibrary(){
+    File f;
+    Track t;
+    std::vector<Track> tracks;
+
+    f.scanFolder( musicFolder_, tracks );
+
+    for ( auto t : tracks ) {
+        db_.addArtist( t.artist.toCString() );
+        db_.addGenre( t.genre.toCString() );
+        db_.addAlbum( t );
+        db_.addTrack( t );
+    }
+}