AppKit: BMessage Add/Find/Get/Has/ReplaceNodeRef

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 <[email protected]>

headers/private/app/MessageUtils.h

@@ -5,15 +5,22 @@
 #include <DataIO.h>
 #include <Entry.h>
 #include <Message.h>
+#include <Node.h>
 #include <SupportDefs.h>
 
 
 namespace BPrivate {	// Only putting these here because Be did
 
+// entry_ref
 status_t entry_ref_flatten(char* buffer, size_t* size, const entry_ref* ref);
 status_t entry_ref_unflatten(entry_ref* ref, const char* buffer, size_t size);
 status_t entry_ref_swap(char* buffer, size_t size);
 
+// node_ref
+status_t node_ref_flatten(char* buffer, size_t* size, const node_ref* ref);
+status_t node_ref_unflatten(node_ref* ref, const char* buffer, size_t size);
+status_t node_ref_swap(char* buffer, size_t size);
+
 uint32 CalculateChecksum(const uint8 *buffer, int32 size);
 
 }	// namespace BPrivate