Merge pull request adafruit#66 from matt-land/remove-type-changes

Remove reassigning variables with new types, pass Mypy

Merge pull request adafruit#63 from FoamyGuy/png_typing_and_example

adding type annotations and png example script

Merge pull request adafruit#64 from tekktrik/dev/use-unified-workflows

Use unified workflows

Merge pull request adafruit#61 from deshipu/png

Add PNG support

Use year duration range for copyright attribution

Fix version strings in workflow files

Add setuptools-scm to build system requirements

Signed-off-by: Alec Delaney <tekktrik@gmail.com>

Added cp.org link to index.rst

Set language to "en" for documentation

Signed-off-by: Alec Delaney <tekktrik@gmail.com>

Merge pull request adafruit#60 from matt-land/add-typing

Add types for adafruit#56 Missing type annotations