Fix various clazy warnings

src/playlistparsers/cueparser.cpp

@@ -68,7 +68,7 @@ SongList CueParser::Load(QIODevice *device, const QString &playlist_path, const
   // read the first line already
   QString line = text_stream.readLine();
 
-  QList<CueEntry> entries;
+  QVector<CueEntry> entries;
   int files = 0;
 
   // -- whole file

src/playlistparsers/m3uparser.cpp

@@ -138,10 +138,7 @@ void M3UParser::Save(const SongList &songs, QIODevice *device, const QDir &dir,
       continue;
     }
     if (writeMetadata) {
-      QString meta = QString("#EXTINF:%1,%2 - %3\n")
-                         .arg(song.length_nanosec() / kNsecPerSec)
-                         .arg(song.artist())
-                         .arg(song.title());
+      QString meta = QString("#EXTINF:%1,%2 - %3\n").arg(song.length_nanosec() / kNsecPerSec).arg(song.artist(), song.title());
       device->write(meta.toUtf8());
     }
     device->write(URLOrFilename(song.url(), dir, path_type).toUtf8());

src/playlistparsers/playlistparser.cpp

@@ -112,7 +112,8 @@ QString PlaylistParser::FilterForParser(const ParserBase *parser, QStringList *a
 }
 
 QString PlaylistParser::default_extension() const {
-  return default_parser_->file_extensions()[0];
+  QStringList file_extensions = default_parser_->file_extensions();
+  return file_extensions[0];
 }
 
 QString PlaylistParser::default_filter() const {