Realize all known field types for BC to 4.x, or at least the once not deprecated (TBD).
EZP-22949 Basic RichText editing
EZP-24317 5.x Rating
EZP-19735 Implement ezpage field type
EZP-19716 Finish implementing XmlText
EZP-19740 Implement ezemail field type
EZP-19752 Implement ezgmaplocation field type