more BGMusic updates

- update getCategoryList to return obj
- 2 custom categories
- improved classic support
- only tell client to refresh playlist if the playlist has changed
- move reset defaults for bgmusic due to autosubmit onleave on category page
- rearrange songs: move Lufia Fortress near Lufia Map

zefie_wtvp_minisrv/ServiceVault/wtv-setup/reset-musicobj.js

@@ -1,6 +1,6 @@
 var music_obj = {};
-ssid_sessions[socket.ssid].setSessionData("wtv-bgmusic", Object.assign({}, music_obj));
+ssid_sessions[socket.ssid].setSessionData("wtv-bgmusic", music_obj);
 ssid_sessions[socket.ssid].saveSessionData();
 headers = `300 OK
-Location: wtv-setup:/choose-bg-songs`;
-
+Location: wtv-setup:/choose-bg-songs
+wtv-backgroundmusic-load-playlist: wtv-setup:/get-playlist`;