Implement config-driven unlock groups so that multiple things can be unlocked at once (including buildings)

src/lib/config/ModulesConfig.h

@@ -40,10 +40,6 @@ struct ModuleRepairCapability
 struct ModuleDef
 {
     std::string id;
-    int unlockAtStationLevel;
-    // Prerequisite schematic ids that must be explicitly unlocked before this
-    // schematic can enter the drop pool (REQ-LOCK-PREREQ). Empty = none.
-    std::vector<std::string> unlockRequires;
     std::vector<std::string> surfaceMask;
     std::vector<RecipeIngredient> materials;
     double productionTimeSeconds;