Package =TWiki::Prefs::Parser 
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 
TopicPrefs 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.
 ClassMethod new () -> topicparserobject 
Construct a new parser object.
 ObjectMethod parseText ($text,$prefs) 
Parse settings from text and add them to the preferences in $prefs
 ObjectMethod parseMeta ($metaObject,$prefs) 
Traverses through all PREFERENCE attributes of the meta object, creating one 
setting named with $settingPrefPrefix . 'title' for each.  It also 
creates an entry named with the field 'name', which is a cleaned-up, 
space-removed version of the title.
Settings are added to the $prefs passed.