Converted some content to the new event hooks and listeners systems in order to clean up code a bit

Added interfaces for standardizing the saving/loading process for data, and allowing it to be declared independently of an entry in PlayerSaver/PlayerSaveParser

Server/src/main/kotlin/api/PersistPlayer.kt

@@ -0,0 +1,19 @@
+package api
+
+import core.game.node.entity.player.Player
+import org.json.simple.JSONObject
+
+interface PersistPlayer {
+    /**
+     * NOTE: This should NOT reference nonstatic class-local variables.
+     * You need to fetch a player's specific instance of the data and save from that.
+     * For reference, see [rs09.game.node.entity.skill.slayer.SlayerManager]
+     */
+    fun savePlayer(player: Player, save: JSONObject)
+    /**
+     * NOTE: This should NOT reference nonstatic class-local variables.
+     * You need to fetch a player's specific instance of the data and parse to that.
+     * For reference, see [rs09.game.node.entity.skill.slayer.SlayerManager]
+     */
+    fun parsePlayer(player: Player, data: JSONObject)
+}

Server/src/main/kotlin/api/PersistWorld.kt

@@ -0,0 +1,6 @@
+package api
+
+interface PersistWorld {
+    fun saveWorld()
+    fun parseWorld()
+}

Server/src/main/kotlin/api/events/Events.kt

@@ -12,4 +12,5 @@ data class LitFireEvent(val logId: Int) : Event
 data class InteractionEvent(val target: Node, val option: String) : Event
 data class ButtonClickedEvent(val iface: Int, val buttonId: Int) : Event
 data class UsedWithEvent(val used: Int, val with: Int) : Event
-data class SelfDeath(val killer: Entity) : Event
+data class SelfDeath(val killer: Entity) : Event
+data class TickEvent(val source: Entity) : Event