[decode] Turn on lax mode when we have an OpenStep property list.
[encode] Add NewEncoderForFormat, which takes a plist format. Create the generator on Encode (not on init).
[plist] Move this type declaration to where it makes more sense :P
[text] Add output format support to textPlistGenerator.
[text] Add support for GNUStep encoding (for ints, reals, bools and dates).
[text] Parse GNUStep-encoded values. Only lax-decode if we're in OpenStep format!
[text] Eat whitespace in data blocks.