This allows you to pass node_ref's around like you can entry_ref's.
Added node_ref_flatten(), node_ref_unflatten() and node_ref_swap() to
MessageUtils. These are close cousins to entry_ref_flatten(),
entry_ref_unflatten(), and entry_ref_swap() but for node_ref's.
Added B_NODE_REF_TYPE to TypeConstants.h in the Support Kit.
Added B_NODE_REF_TYPE to Debugger and ByteOrder in Support Kit,
B_NODE_REF_TYPE is treated the same as a B_REF_TYPE (entry_ref).
Add documentation for new NodeRef methods and B_NODE_REF_TYPE.
Change-Id: I32c6ed276bf1a7894a835b9fc9de5a882c35883c
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3182
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>