Document RCP functions (#1087)

* Document RCP functions

* Rename functions according to convention

* Rename file and functions to RcpUtils

src/code/main.c

@@ -111,6 +111,6 @@ void Main(void* arg) {
 
     osSyncPrintf("mainproc 後始末\n"); // "Cleanup"
     osDestroyThread(&sGraphThread);
-    func_800FBFD8();
+    RcpUtils_Reset();
     osSyncPrintf("mainproc 実行終了\n"); // "End of execution"
 }