optimize(gold): apply more buffer pools

gold/head/pool.go

@@ -1,6 +1,10 @@
 package head
 
-import "sync"
+import (
+	"sync"
+
+	"github.com/fumiama/WireGold/helper"
+)
 
 var packetPool = sync.Pool{
 	New: func() interface{} {
@@ -16,6 +20,12 @@ func SelectPacket() *Packet {
 // PutPacket 将 Packet 放回池中
 func PutPacket(p *Packet) {
 	p.idxdatsz = 0
-	p.Data = nil
+	if p.buffered {
+		helper.PutBytes(p.data)
+		p.buffered = false
+	}
+	p.a, p.b = 0, 0
+	p.data = nil
+	p.rembytes = 0
 	packetPool.Put(p)
 }