This Prefs-internal class is used to parse * Set and * Local statements
from arbitrary text, and extract settings from meta objects. It is used
by Topic Prefs to parse preference settings from topics.
This class does no validation or duplicate-checking on the settings; it
simply returns the recognized settings in the order it sees them in.
Static Function parse( $topicObject, $prefs )
Parse settings from the topic and add them to the preferences in $prefs