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

src/test/CMakeLists.txt

@@ -25,6 +25,7 @@ add_files(
     ThreatCostCalculatorTest.cpp
     RecipeSchematicTest.cpp
     UnlockPrereqTest.cpp
+    UnlockGroupTest.cpp
     ArtifactWinConditionTest.cpp
     DeterminismTest.cpp
     CommandTest.cpp