feat(mechanics): Pit boarding attack against boarding defense

[petervdmeer]

Feature

This PR addresses the bug/feature described in PR #9797 in a different way.

Summary

Boarding attack gets countered by boarding defense of the boarded victim, and the boarded victim can choose to counter-attack or not:

• The boarding action ends when both parties choose to defend. (As was before)
• When both sides choose attack, then there are 2 rounds reported; one where the player attacks, and one where the victim attacks.
• When only one side attacks, then you only see "You attacked" or "They attacked".

Screenshots

Usage examples

Just perform attack and defense as before during boarding.

Testing Done

AI is indeed counter-attacking when the chances are good. AI counter-attacks could be improved based on AI personalities.

Save File

N/A; just attack and board some ships. (Or see #9797 for an example with 3 ships to board.)

Performance Impact

None expected.

[petervdmeer]

(Converted to draft, needs a few more tests and some screenshots.)

[petervdmeer]

Ready for review now.

[OcelotWalrus]

I prefer #9797, but I guess this PR still fixes the issue.