implemented basic support for MIDI NOTE ON/OFF events

 * MIDIVelocityStream will report the velocities on a particular
   note. This can be used to build polyphonic instruments.
 * MIDINoteStream will report all possible notes on a particular
   channel. The velocity of the note last triggered is also encoded
   into the stream values. This can be used to build simple
   monophonic instruments.
 * Map bit methods to stream methods, e.g. Stream:band()
   Is especially useful for streams that encode multiple values
   into single integers for performance reasons.
 * mtof() and ftom() methods for converting from and to MIDI note
   numbers. mtof() is very efficient since its values are all
   precalculated in a lookup table.
 * fixed tostring() method for streams smaller than 1024 samples

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