Add packages to plugins

game/plugin/entity/spawn/src/spawn.plugin.kts

@@ -1,23 +1,18 @@
 import org.apollo.cache.def.NpcDefinition
 import org.apollo.game.model.entity.Npc
+import org.apollo.game.plugin.entity.spawn.Spawns
+import org.apollo.game.plugin.util.lookup.lookup_npc
 
 start { world ->
     Spawns.list.forEach {
-        val definition = if (it.id != null) NpcDefinition.lookup(it.id!!) else lookup_npc(it.name)
-        if (definition == null) {
+        val definition = it.id?.let { NpcDefinition.lookup(it) } ?: lookup_npc(it.name) ?:
             throw IllegalArgumentException("Invalid NPC name or ID ${it.name}, ${it.id}")
-        }
 
         val npc = Npc(world, definition.id, it.position)
         npc.turnTo(it.position.step(1, it.facing))
 
-        if (it.spawnAnimation != null) {
-            npc.playAnimation(it.spawnAnimation)
-        }
-
-        if (it.spawnGraphic != null) {
-            npc.playGraphic(it.spawnGraphic)
-        }
+        it.spawnAnimation?.let(npc::playAnimation)
+        it.spawnGraphic?.let(npc::playGraphic)
 
         world.register(npc)
     }