Openstep-plist

Write strings quoted if they can be confused with an integer or a float, or if they contain any characters that is not in the following set:


$.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz

Reverted the default value of `use_numbers` to False in the parser's `load` and `loads` functions. So by default the parser will treat any plist string whether quoted or unquoted as a Python unicode string.

Set it to True to enable the feature whereby unquoted plist strings are attempted to be converted to Python int or float.

Implemeted an OpenStep plist writer. Added two new public functions `dump` and `dumps`: one writes to a file object, the other returns a unicode string.

The parser now attempts to cast unquoted plist strings to Python int or float, unless `use_numbers=False` is disabled.

Initial release. The only two public functions exported are `loads` and `load`: one reads from a string, the other from a file object.
They parse the plist into a Python dict, list, unicode string, bytes (for binary data) or any combination of them.
A custom `dict_type` can also be defined (e.g. `OrderedDict`).