added preliminary AVRCP support to those devices use Broadcom BT.
further lowered CPU usage when minimized, about 50% of the previous version.
added option (SaveLastMusic) to reload the last playing music. (read the Settings section below for details)
added option (AlwaysLoadAlbumPic) to always load an album art for each music. But if you've already organised the music files in folders, it's not necessary to enable it so as to safe battery life. (read the Settings section below for details)
fixed cannot retrieve some ID3 embedded album arts.
