Add port of the 'dummys' plugin from Ruby

game/src/plugins/dummy/dummy.plugin.kts

@@ -0,0 +1,74 @@
+import org.apollo.game.action.DistancedAction
+import org.apollo.game.message.impl.ObjectActionMessage
+import org.apollo.game.model.Animation
+import org.apollo.game.model.Position
+import org.apollo.game.model.entity.Player
+import org.apollo.game.model.entity.Skill
+import org.apollo.net.message.Message
+
+/**
+ * A list of [ObjectDefinition] identifiers which are training dummies.
+ */
+val DUMMY_IDS = setOf<Int>(823)
+
+on { ObjectActionMessage::class }
+        .where { option == 2 && id in DUMMY_IDS }
+        .then { DummyAction.start(this, it, position) }
+
+class DummyAction(val player: Player, position: Position) : DistancedAction<Player>(0, true, player, position, DISTANCE) {
+
+    companion object {
+
+        /**
+         * The maximum level a player can be before the dummy stops giving XP.
+         */
+        const val LEVEL_THRESHOLD = 8
+
+        /**
+         * The number of experience points per hit.
+         */
+        const val EXP_PER_HIT = 5.0
+
+        /**
+         * The minimum distance a player can be from the dummy.
+         */
+        const val DISTANCE = 1
+
+        /**
+         * The [Animation] played when a player hits a dummy.
+         */
+        val PUNCH_ANIMATION = Animation(422)
+
+        /**
+         * Starts a [DummyAction] for the specified [Player], terminating the [Message] that triggered it.
+         */
+        fun start(message: Message, player: Player, position: Position) {
+            player.startAction(DummyAction(player, position))
+            message.terminate()
+        }
+
+    }
+
+    var started = false
+
+    override fun executeAction() {
+        if (started) {
+            val skills = player.skillSet
+
+            if (skills.getSkill(Skill.ATTACK).maximumLevel >= LEVEL_THRESHOLD) {
+                player.sendMessage("There is nothing more you can learn from hitting a dummy.")
+            } else {
+                skills.addExperience(Skill.ATTACK, EXP_PER_HIT)
+            }
+
+            stop()
+        } else {
+            mob.sendMessage("You hit the dummy.")
+            mob.turnTo(this.position)
+            mob.playAnimation(PUNCH_ANIMATION)
+
+            started = true
+        }
+    }
+
+}