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as reported by lgtm.com

Header creation fails with non-utf8 locale and python3.
Simply set LC_ALL="C" and use python3 to reproduce the issue.

env LC_ALL="C" ./scripts/MakeHeader.py MetersPanel.c
Traceback (most recent call last):
  File "./scripts/MakeHeader.py", line 32, in <module>
    for line in file.readlines():
  File "/usr/lib64/python3.5/encodings/ascii.py", line 26, in decode
    return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 956: ordinal not in range(128)

This changes is python2 and python3 compatible

cStringIO.StringIO module is removed because it is not able to accept unicode strings
https://docs.python.org/2/library/stringio.html#cStringIO.StringIO

Only write a new .h file if something changed for the header file being created.
This prevents a lot of recompilation during development

This is a work-in-progress, code is currently broken.
(Some actions, and notably, the header, are missing.)

using the 'static' storage class instead. Automatically generates
'extern' declarations in headers for non-static data.