ksys: Start adding PhysicsConstraints

src/KingSystem/Physics/System/physConstraint.cpp

@@ -0,0 +1,10 @@
+#include "KingSystem/Physics/System/physConstraint.h"
+
+namespace ksys::phys {
+
+void Constraint::destroy(Constraint* instance) {
+    if (instance)
+        delete instance;
+}
+
+}  // namespace ksys::phys

src/KingSystem/Physics/System/physConstraint.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <prim/seadRuntimeTypeInfo.h>
+
+namespace ksys::phys {
+
+class Constraint {
+    SEAD_RTTI_BASE(Constraint)
+
+public:
+    // FIXME: types
+    Constraint();
+    virtual ~Constraint();
+
+    /// No-op if instance is null.
+    static void destroy(Constraint* instance);
+};
+
+}  // namespace ksys::phys