Add support for DFRobot-Mini / MP3-TF-16P

[sleemanj]

The DFRobot Mini / MP3-TF-16P protocol is similar, it has an additional version byte and two checksum bytes, and also adds some response data, it may be easy enough to extend JQ6500_Serial to handle this player also

#8 (comment)

[thijstriemstra]

datasheet and more info here: https://wiki.dfrobot.com/DFPlayer_Mini_SKU_DFR0299