Implement remaining CStateManager stubs

Runtime/World/CDestroyableRock.cpp

@@ -0,0 +1,16 @@
+#include "CDestroyableRock.hpp"
+
+namespace urde
+{
+
+CDestroyableRock::CDestroyableRock(TUniqueId id, bool active, const std::string& name, const CEntityInfo& info,
+                                   const zeus::CTransform& xf, CModelData&& modelData, float mass, const CHealthInfo& health,
+                                   const CDamageVulnerability& vulnerability, const CMaterialList& matList, ResId fsm,
+                                   const CActorParameters& actParams, const CModelData& modelData2)
+: CAi(id, active, name, info, xf, std::move(modelData), modelData.GetBounds(),
+      mass, health, vulnerability, matList, fsm, actParams, 0.3f, 0.8f)
+{
+
+}
+
+}