feat(creek): calm the creek down as the round thins out

[theEvilReaper]

Proposed changes

This PR makes the creek ease off as fewer of the starting survivors are left alive. Until now the last few players took all of its pressure and were hunted almost nonstop. Now it hunts a bit slower, teleports less eagerly and waits longer before coming back. While everyone is still alive the creek plays exactly as before. With only one survivor left it is noticeably, but only slightly, calmer.

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

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• I have read the CONTRIBUTING.md
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[github-actions]

Test results

  642 files    642 suites   4m 20s ⏱️
1 479 tests 1 477 ✅ 2 💤 0 ❌
4 437 runs  4 431 ✅ 6 💤 0 ❌

Results for commit 24f3ced.