Merge pull request #12166 from michaeljb/fix-action-error

[core] fix `ActionError`

[core] debugging/error logging improvements (#12150)

* `Action::Base#to_json` for convenience

* `Game::Base#to_json` to dump a game in a format that can be imported to
  hotseat, especially useful for investigating why a migration fails after
  making some changes but is unable to finish

    * save some more values from the input `data` at creation time so they can
      be included in the JSON dump; refactor `load()` a little bit for less
      repetition of kwargs

* log `@broken_action` in `Game::Base#maybe_raise!`

* `Game::Base#process_to_action` returns `self`, like `process_action`

[1880] fix check for player debt, fixes #12147

Merge pull request #12119 from michaeljb/follow-ups

[core] Fix dropped cash - follow-up fixes for 1861/1867, 1822CA, 18GB

Merge pull request #12146 from michaeljb/rack

[core] upgrade rack and roda

Downgrade rack to latest 3.0.18

Fixes #12139, caused by #12125

Merge pull request #12135 from tobymao/strict-fixtures

[dev] run fixtures in specs and in browser with `strict: true`

Merge pull request #12111 from michaeljb/fix-import-json

fix importing JSON as hotseat game

[dev] validate script: change how `families` kwarg works (#12078)

instead of taking a list of families, make it boolean; by default, validate the
whole family for every title given to `validate_all()`. This will ensure things
like `1824 Cisleithania` is validated when `1824` is given without relying on
the memory of the human running the script

Merge pull request #12056 from perwestling/fix/12049

[1824] Correct train limit for minor, fixes #12049