add SwingArm, Respawn and UseItem function

bot/motion.go

@@ -0,0 +1,30 @@
+package bot
+
+import (
+	"github.com/Tnze/go-mc/data"
+	pk "github.com/Tnze/go-mc/net/packet"
+)
+
+//SwingArm swing player's arm.
+//hand could be 0: main hand, 1: off hand
+func (c *Client) SwingArm(hand int) error {
+	return c.conn.WritePacket(pk.Marshal(
+		data.AnimationServerbound,
+		pk.VarInt(hand),
+	))
+}
+
+//Respawn the player when it was dead.
+func (c *Client) Respawn() error {
+	return c.conn.WritePacket(pk.Marshal(
+		data.ClientStatus,
+		pk.VarInt(0),
+	))
+}
+
+func (c *Client) UseItem(hand int) error {
+	return c.conn.WritePacket(pk.Marshal(
+		data.UseItem,
+		pk.VarInt(hand),
+	))
+}