PKG move requirements into pyproject.toml

MNT update copyright

MNT terse labels in legend

refactor from pyqtgraph to matplotlib (#214)

* MNT #213 first steps

* DOC #213

* MNT #213 finish the refactor

* STY #213 per 'black'

* TST #213 refactor unit tests

* STY #213 isort

* TST #213 local passed, CI failed

* TST #213 defensive version-based test

* MNT #213 title & subtitle

* MNT #213 an edge case that happens during unit testing

* MNT #213 re-arrange that code

* MNT #213 per review

* MNT #213 add one color: more color&symbol permutations

STY #99 lint the workflow file

Merge pull request #177 from BCDA-APS/101-register-with-PyPI

publish on PyPI

DOC #101 note now on PyPI

PKG #101 remove invalid classifiers

CI #101 restore publish iff new tag

DOC #103