initial work on ExperienceAddedMessage and tests

common/src/main/scala/net/psforever/packet/GamePacketOpcode.scala

@@ -537,7 +537,7 @@ object GamePacketOpcode extends Enumeration {
     case 0xb6 => game.ZonePopulationUpdateMessage.decode
     case 0xb7 => game.DisconnectMessage.decode
     // 0xb8
-    case 0xb8 => noDecoder(ExperienceAddedMessage)
+    case 0xb8 => game.ExperienceAddedMessage.decode
     case 0xb9 => game.OrbitalStrikeWaypointMessage.decode
     case 0xba => game.KeepAliveMessage.decode
     case 0xbb => noDecoder(MapObjectStateBlockMessage)

common/src/main/scala/net/psforever/packet/game/ExperienceAddedMessage.scala

@@ -0,0 +1,35 @@
+// Copyright (c) 2016 PSForever.net to present
+package net.psforever.packet.game
+
+import net.psforever.packet.{GamePacketOpcode, Marshallable, PlanetSideGamePacket}
+import scodec.Codec
+import scodec.codecs._
+
+/**
+  * Displays a message about being awarded experience points in the events chat.<br>
+  * <br>
+  * This packet does not actually award any experience points.
+  * It merely generates the message:<br>
+  *   `"You have been awarded x experience points."`<br>
+  * ... where `x` is the number of experience points that have been promised.
+  * If the `Boolean` parameter is `true`, `x` will be equal to the number provided followed by the word "Command."
+  * If the `Boolean` parameter is `false`, `x` will be represented as an obvious blank space character.
+  * (Yes, it prints to the events chat like that.)
+  * @param exp the number of (Command) experience points earned
+  * @param unk defaults to `true` for effect;
+  *            if `false`, the number of experience points in the message will be blanked
+  */
+final case class ExperienceAddedMessage(exp : Int,
+                                        unk : Boolean = true)
+  extends PlanetSideGamePacket {
+  type Packet = ExperienceAddedMessage
+  def opcode = GamePacketOpcode.ExperienceAddedMessage
+  def encode = ExperienceAddedMessage.encode(this)
+}
+
+object ExperienceAddedMessage extends Marshallable[ExperienceAddedMessage] {
+  implicit val codec : Codec[ExperienceAddedMessage] = (
+    ("cep" | uintL(15)) ::
+      ("unk" | bool)
+    ).as[ExperienceAddedMessage]
+}