fix: games tools write whole files, name options

The games importers wrote through fixed .part names, the new options had
no help text, and romfolders stopped on the first setup the offline cache
lacked. RetroArch's rom folder map is regenerated from its source spec
(path null, as the schema says). The installer's Python 3.8 job imports
the games tests without pyyaml, so the region rules load lazily.

tests/test_scraper_contract.py

@@ -738,6 +738,9 @@ class EveryGitHubApiCallerSendsTheToken(unittest.TestCase):
             str(path.relative_to(scripts))
             for path in [*scripts.rglob("*.py"), *scripts.rglob("*.sh")]
             if "api.github.com" in (source := path.read_text(encoding="utf-8"))
+            # arcade_parent_importer names API URLs and sends them through
+            # romset_dat_importer._api_json, which holds the token.
+            and ("Request(" in source or "urlopen(" in source or path.suffix == ".sh")
             and "GITHUB_TOKEN" not in source
             and "github_headers(" not in source
             and "github_token(" not in source