refactor: power-up statistics come from the power-up's pickup skill

TrackLOTCollection hardcoded the 15 life/armor/imagination power-up LOTs. A power-up
(Objects.type "Powerup") now counts towards the statistic of what its pickup skill
restores: a Heal, RepairArmor or Imagination behavior in the skill's behavior tree.
Gives the same result for the 15 LOTs; "HoT Powerup" (8208, heal over time) now also
counts as a life power-up.

Refs #691

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dGame/dComponents/CharacterComponent.h

@@ -13,6 +13,7 @@
 #include <set>
 #include "Loot.h"
 #include "StatisticID.h"
+#include <optional>
 
 enum class eGameActivity : uint32_t;
 
@@ -190,6 +191,13 @@ public:
 	 */
 	void TrackLOTCollection(LOT lot);
 
+	/**
+	 * The statistic a power-up counts towards, from what its pickup skill restores (life, armor or imagination)
+	 * @param lot the LOT that was picked up
+	 * @return the statistic, or nothing when the LOT is not such a power-up
+	 */
+	static std::optional<StatisticID> GetPowerUpStatistic(LOT lot);
+
 	/**
 	 * Handles a change in health and updates the statistics
 	 * @param health the health delta