Rename GF Gname, Rfu, finish bulk of Union Room, more link doc

src/librfu_rfu.c

@@ -1,6 +1,14 @@
 #include <limits.h>
 #include "librfu.h"
 
+// If expanding the length of the player name and wireless link functionality is
+// desired, ensure that the name string is limited in size when it's copied from the
+// saveblock to any Rfu-related fields (e.g. in SetHostRfuUsername).
+// If wireless link functionality is not desired ignore or delete this warning.
+#if RFU_USER_NAME_LENGTH < (PLAYER_NAME_LENGTH + 1)
+#warning "The Wireless Adapter hardware expects a username of no more than 8 bytes."
+#endif
+
 struct LLSFStruct
 {
     u8 frameSize;