* Add eslint rule to flag up me forgetting to camelCase - I'd say I introduced all the snake_cases that are fixed here
* Allow some dubious snake cases for now; we could examine again whether they can be converted to `camelCase['snake_var']` if we need to maintain backwards compatibility of output
* add ESLINT_USE_FLAT_CONFIG against eslint v8.57.0 in order to continue using the deprecated .eslintrc.js method
