- optimize `percent.cv01` and ` numbersign.cv01` #245
- fix contour sequence issues
- remove space required in `<< ` and ` >>` by default #233
- sharpen latin letters' cross corner, adjust weird glyph stems
- make `ss05` to disable escape char #234
- move double headed arrows and reversed arrows to `ss08`
- improve build script
- improve build base nf script
- add more detailed descriptions in readme and schema
- add support to remove all ligature #248
