ksys/phys: Start adding RigidContactPoints

Super messy stuff. I have no idea what it's used for

src/KingSystem/Physics/System/physMemSystem.h

@@ -10,6 +10,8 @@ namespace ksys::phys {
 class ContactMgr;
 class GroupFilter;
 class RigidBody;
+class RigidContactPoints;
+class RigidContactPointsEx;
 class SystemGroupHandler;
 
 // FIXME: obviously incomplete. Also this should be moved to its own header
@@ -19,15 +21,25 @@ struct RigidBodyRequestMgr {
 
 class MemSystem {
     SEAD_SINGLETON_DISPOSER(MemSystem)
+    MemSystem();
+    virtual ~MemSystem();
+
 public:
     GroupFilter* getGroupFilter(ContactLayerType type) const;
     ContactMgr* getContactMgr() const { return mContactMgr; }
     RigidBodyRequestMgr* getRigidBodyRequestMgr() const { return mRigidBodyRequestMgr; }
 
+    RigidContactPoints* allocContactPoints(sead::Heap* heap, int num, const sead::SafeString& name,
+                                           int a, int b, int c) const;
+    void freeContactPoints(RigidContactPoints* points) const;
+    void registerContactPoints(RigidContactPoints* points) const;
+    void registerContactPointLayerPair(RigidContactPointsEx* points, ContactLayer layer1,
+                                       ContactLayer layer2, bool enabled);
+
     void removeSystemGroupHandler(SystemGroupHandler* handler);
 
 private:
-    u8 _20[0x148 - 0x20];
+    u8 _28[0x148 - 0x28];
     ContactMgr* mContactMgr;
     void* _150;
     void* _158;