Ensure MessageServer.ReqID is 8 byte aligned

Atomic operations such as atomic.AddUint64 must operate on 64-bit aligned memory when running on 32-bit systems, otherwise a runtime will panic occur. This is a known issue in go and might addressed in a future release, see golang/go#36606.

p2p/server/msgserver.go

@@ -42,8 +42,8 @@ type ResponseHandlers struct {
 // MessageServer is a request-response multiplexer on top of the p2p layer. it provides a way to register
 // message types on top of a protocol and declare request and response handlers. it matches incoming responses to requests.
 type MessageServer struct {
+	ReqID              uint64 //request id (must be declared first to ensure 8 byte alignment on 32-bit systems, required by atomic operations)
 	log.Log
-	ReqID              uint64 //request id
 	name               string //server name
 	network            Service
 	pendMutex          sync.RWMutex