Pathins

- minor dependency update patch
- update fonttools dependency to v4.17.1

- support cPython 3.9 interpreter
- bump skia-pathops dependency to v0.5.1.post1

- fix: usage documentation syntax description (missing sub-command)

- minor documentation and project description updates

- add `segments` sub-command with glyph segment line distance and arc length reporting
- performance improvement: removed `sys.stdout.isatty()` check from loops in stringbuilder module
- fix: do not apply ANSI color escapes when we are not in a TTY, includes cyan_text, cyan_bright_text, green_text, and red_text functions in the stringbuilder module
- add `--pretty` mypy option to Makefile type checking target
- add line length = 90 definition to the isort import sorting Makefile target
- bump fontTools dependency to v4.16.1

- add `contours` sub-command with glyph contour number reporting
- change bold cyan glyph name color to bright bold cyan for sub-commands that use this color
- add `stringbuilder.cyan_text` function
- add `stringbuilder.cyan_bright_text` function