Factorio 2.1.13 added build_base_unit_dispatch_cooldown as the last
field of enemy_expansion in the map exchange string, and rejects map
settings without it. Track the full version in the reader state and
read the field for 2.1.13 and later. Adds a fixture string generated
with 2.1.14 and uses it in the load-scenario integration test.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Add options to pass map seed, map exchange string, map gen settings
and/or map settings when creating a save either through the create save
request or the load scenario request.
