Break out main loop step for easier testing and AI dev: now with a feature flag!

[marthinwurer]

• Broke out the main game loop into mainLoopStep() and setupFirstTurn()
• Added a feature flag in settings to enable it for games
• Implemented some basic combat tests
• Ported some SpellAbilityPickerSimulationTests over to simply SpellAbilityPickerTests
• Added a (currently ignored) game fuzzing test
• Added some basic combat tests
• Probably more, I wrote most of this two weeks ago

[Hanmac]

I don't see why public void startFirstTurn(Player goesFirst, Runnable startGameHook) can't call the new mainGameLoop() there too

no need to have the code duplicated

[tool4ever]

Well, I guess this attempt looks less risky than your previous one :p
Imo a preference is overkill though and might actually make things harder since users switching that around would lead to inconsistent reports (even with the log print)

[github-actions]

This PR has not been updated in a while nad has been marked on stale. Stale PRs will be auto closed

[marthinwurer]

Closing to have #6727 be the main effort for this