ksys/phys: Add RigidBody collision filter info functions

Including a bunch of BitFields additions so we can get the desired
codegen without sacrificing readability or flexibility.
(The alternative would be building masks and masking manually.)

getCollisionFilterInfo was changed to return a u32 instead of
EntityCollisionFilterInfo because a collision filter info mask
can be either an EntityCollisionFilterInfo or a ReceiverMask.

(Also at some point we'll probably want to rename
EntityCollisionFilterInfo because that is also used for sensor
rigid bodies and not just for entities.)

src/KingSystem/Physics/System/physSystem.h

@@ -53,7 +53,7 @@ public:
                                        ContactLayer layer2, bool enabled);
 
     // 0x0000007101216a20
-    void x_1(RigidBody* body);
+    void registerRigidBodyForContactSystem(RigidBody* body);
 
     void removeSystemGroupHandler(SystemGroupHandler* handler);