UObject derived type raw variable members should be replaced by TObjectPtr<T>

[jmeyblumbhvr]

As mentioned here: Incremental Garbage Collection
All UPROPERTY() members using UObject derived type raw pointer (T*) should be replaced by a TObjectPtr equivalent to allow project to enable Incremental Reachability Analysis safely.

Enabling this option can make for huge performance gains and will probably become a default or will be really common for projects to adopt.

Unreal mentions a tool named "UnrealObjectPtrTool" to help replacing those raw pointers automatically.

Most if not all UPROPERTY() members in the Houdini Plugin are raw pointers.