Dtools.circular-array

- Major API changes
- class name still `ca`
- initializer takes 1 or 0 iterables
- like Python builtin types `list` or `tuple`
- factory function `CA` provided to create a `ca` from mult args
- like `[]` or `{}`
- otherwise, method names are all snake_case compatible
- examples
- popL -> popl
- pushR -> pushr
- fractionFilled -> fraction_filled
- updated pyproject.toml
- to better match other dtools namespace projects

- Fixed pdoc issues with new typing notation
- updated docstrings
- had to add TypeVars

- Final release as dtools.circular-array
- was previously grscheller.circular-array

- now circular-array indexing methods fully support slicing
- `__getitem__`
- `__setitem__`
- `__delitem__`
- added rotL(n) and rotR(n) methods

- for internal changes
- mostly for consistency across PyPI namespace projects

- regenerated docs for PyPI release