Function settle_heading_classifiers 

pub fn settle_heading_classifiers(
    org_tags: &mut Vec<String>,
    properties: &mut BTreeMap<String, String>,
)

Move classifiers Org can hold onto the heading: a legal :TYPE: and any legal token in :VISSUE_TAGS:. Hyphenated leftovers stay in the property. :TYPE: itself is kept so export and --type filters still read it.