Added keyword of end()
Added Support for Differential Output and documented 5V vs 3V
added GetDiffertialOutput() and SetDiffertialOutput() to change the output, as to create a differential left/right output with a maximum output of 3V.
added documentation support about 5V vs 3.3V base Arduino's in Manual.
added missing [d] description in Help.
added documentation support about 5V vs 3.3V base Arduino's in Manual.
Added support for multiple sdcard in example.
Example of how to specify desired card, if needed.
added getState() as to report other possible states
such as paused but playing.
changed 'p' command of INO to toggle paused, 'r' deprecated.
changed INO play track # command to skip getting track info if failed to start.
changed case of get.. and set.. functions all to lower case for consistency.
corrected available static quota
changed ADMixer from commented to #IF(0)
Added Trouble Shooting support for migration to sd.begin
added VU meter support