Replace midi.c with midi.py (issue 312300043 by address@hidden)

[graham]

Reviewers: ,

Message:
Please review.  Running "make install" does *not* result in a usable
midi2ly, but that's an existing problem not related to this (which I'll
discuss separately).

For testing purposes, you can use:
    PYTHONPATH=$HOME/.local/share/lilypond/2.19.55/python/ midi2ly

(assuming that you installed to $HOME/.local/ )

Description:
Remove midi.c


midi2ly: replace unprintables with ~


midi2ly: fix non-printable in MIDI text


Add rewrite of midi.c in python

Work was done in 2012, and came from here:
    https://codereview.appspot.com/7016046/

Please review this at https://codereview.appspot.com/312300043/

Affected files (+211, -474 lines):
  M python/GNUmakefile
  D python/midi.c
  A python/midi.py
  M scripts/midi2ly.py