Update to use new layering/line wrapping technique

[stevedlawrence]

This schema uses things like ``dfdl:separator="%NL;%SP;" to handle line wrapping. So rather than handling line wrapping appropriately, it just treates line wrapping as a separator and icalendar values can be arrays of values rather than one long value.

This is incorrect, and actually causes failures in some cases. For example, if you wrap on on parameter key then this fails and you end up with a almost empty infoset. For example:

ATTENDEE;CN="Surname, First Name (Long stuff here)";ROLE=OPT-PARTICIPANT;R
	SVP=TRUE:mailto:[email protected]

In this case, we wrap in the middle of the RSVP key, which the schema can't handle. We only allow wrapping on values. And we can't prevent wrapping in the middle of a key.

Instead, we should use the new line wrapping technique to handle the line wrappings appropiately. We then can remove all the hacks that treat values as a sequence of NL separators.