Strings encoded with low code-points can't be used to set text fields

[wmj]

Encodings which use code-points lower than \x20 (such as utf16) are not allowed by the text field pattern.

>>> from csb43 import csb43
>>> a = csb43.Account(encoding="utf16")
>>> a.shortName = "a"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "workspace/csb43/csb43/csb43/account.py", line 301, in shortName
    self._set_short_name(value)
  File "workspace/csb43/csb43/utils/__init__.py", line 103, in _wrapped
    check_string(pattern, *args, **kw)
  File "workspace/csb43/csb43/utils/__init__.py", line 79, in check_string
    ) % (repr(field), repr(pattern)), strict=strict, **csbexc)
  File "workspace/csb43/csb43/utils/__init__.py", line 54, in raiseCsb43Exception
    raise Csb43Exception(value)
csb43.utils.Csb43Exception: Bad format: content b'\xff\xfea\x00                      ' mismatches the expected format rb'^[\\x20-\\xFF]{26}$' for this field

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