Simple system to run the Detective game in City Dark

Iteration on City Dark proto-system , with big thanks to E. Steiner for the inspiration to revisit the previous proto-system, and "Disco Elysium" for creating a cool detective game without combat, something that previously was a fate of only some visual novels; additional thanks to "Esoteric Enterprises" by Emmy Allen for the grievous wounds effects and the idea of player's doppelganger (which…