ksys/phys: Start adding ContactMgr

Also renames ContactInfoTable to ContactMgr because the contact info
table is a separate data structure that's managed by ContactMgr;
the manager itself handles more than just the table data

src/KingSystem/Physics/System/physMemSystem.h

@@ -2,23 +2,38 @@
 
 #include <basis/seadTypes.h>
 #include <heap/seadDisposer.h>
+#include "KingSystem/Physics/System/physDefines.h"
+#include "KingSystem/Utils/Types.h"
 
 namespace ksys::phys {
 
+class ContactMgr;
+class GroupFilter;
 class RigidBody;
 class SystemGroupHandler;
 
+// FIXME: obviously incomplete. Also this should be moved to its own header
+struct RigidBodyRequestMgr {
+    void sub_7100FA6C8C(bool, RigidBody*);
+};
+
 class MemSystem {
     SEAD_SINGLETON_DISPOSER(MemSystem)
 public:
-    struct Struct160 {
-        void sub_7100FA6C8C(bool, RigidBody*);
-    };
+    GroupFilter* getGroupFilter(ContactLayerType type) const;
+    ContactMgr* getContactMgr() const { return mContactMgr; }
+    RigidBodyRequestMgr* getRigidBodyRequestMgr() const { return mRigidBodyRequestMgr; }
 
     void removeSystemGroupHandler(SystemGroupHandler* handler);
 
-    u8 _20[0x140];
-    Struct160* _160;
+private:
+    u8 _20[0x148 - 0x20];
+    ContactMgr* mContactMgr;
+    void* _150;
+    void* _158;
+    RigidBodyRequestMgr* mRigidBodyRequestMgr;
+    u8 _168[0x480 - 0x168];
 };
+KSYS_CHECK_SIZE_NX150(MemSystem, 0x480);
 
 }  // namespace ksys::phys