Adds Playlist Download

* Removed unusable history.json
* Adds legit m3u playlist download so that users can load it
into mpd or other music players

player.js

@@ -200,12 +200,21 @@
     function downloadHistory() {
         const historyArray = getHistory();
         let element = document.createElement("a");
+        let playListData  = '#EXTM3U';
+        historyArray.forEach((musicData) => {
+            playListData = `${playListData}
+
+#EXTINF:${(musicData.duration/60000).toFixed(2)}, ${musicData.title}
+https://retrowave.ru/${musicData.streamUrl}
+`;
+        });
+
         element.setAttribute(
             "href",
-            "data:application/json;charset=utf-8," +
-            encodeURIComponent(JSON.stringify(historyArray))
+            "data:audio/x-mpegurl;;charset=utf-8," +
+            encodeURIComponent(playListData)
         );
-        element.setAttribute("download", "history.json");
+        element.setAttribute("download", "retrowave_playlist.m3u");
 
         element.style.display = "none";
         document.body.appendChild(element);