fix: add explicit null check for old_table

style: add .clang-format and reformat source

build: update CMake versions and language standards

test: switch to catch2 unit tests and add some functions

Update ci.yml to latest checkout action

Update README.md

Update CI to use clang 14

Update clib.json to v2.0.3

Include standard headers to use `bool` and `size_t`

Consistency

Fix issue #13

readme: link CI badge to CI status page

clib.json: reference v2.0.2 tag

Rename package.json to clib.json

Update package.json