load_json_file encoding error on some files

[petergreen86]

Some files fail with encoding errors:

Traceback (most recent call last):
  File "split_scan.py", line 50, in <module>
    scanData  = load_json_file(argv[1])
  File "split_scan.py", line 13, in load_json_file
    data = json.load(f)
  File "C:\Users\pgreen.SYNOPSYS\AppData\Local\Programs\Python\Python38\lib\json\__init__.py", line 293, in load
    return loads(fp.read(),
  File "C:\Users\pgreen.SYNOPSYS\AppData\Local\Programs\Python\Python38\lib\encodings\cp1252.py", line 23, in decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x81 in position 899969521: character maps to <undefined>

This can be fixed by changing load_json_file to read as UTF-8

def load_json_file(filename):
    with open(filename, encoding='utf-8') as f:
        data = json.load(f)
    return data