Separate detection history into draws vs. logic

[swo]

Aims to resolve #14 -- There are tests for all parts of the logic except the detection resolution

• This PR separates detection into generation of the relevant quantities, and then the resolution
• I got around the crazy branching logic by making a list of potential detections (length 0, 1, or 2) and filtering it
• Add tests for each possible situation:
  • Not eligible for passive nor active
  • Eligible for passive only, and detected
  • Eligible for passive only, but detection after recovery, so no detection
  • 2x tests for active, like the above
  • Both trigger, one of them wins (x2)
  • Both trigger, neither wins