Add LogoutListener interface - allows a class to call some code on player logout - improved version of logout listeners.

Add StartupListener interface - allows a class to call some code on server startup without adding messy code elsewhere
Add ShutdownListener interface - allows a class to call some code on server shutdown without adding messy code elsewhere
Add TickListener interface - allows a class to call some code on each tick without adding messy code elsewhere
Converted all applicable content over to using these new interfaces

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

@@ -3,5 +3,10 @@ package api
 import core.game.node.entity.player.Player
 
 interface LoginListener {
+    /**
+     * NOTE: This should NOT reference any non-static class-local variables.
+     * If you need to access a player's specific instance, use an attribute.
+     * Alternatively, consider using an [api.events.EventHook] if applicable.
+     */
     fun login(player: Player)
 }

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

@@ -0,0 +1,11 @@
+package api
+
+import core.game.node.entity.player.Player
+
+interface LogoutListener {
+    /**
+     * NOTE: This should NOT reference any non-static class-local variables.
+     * If you need to access a player's specific instance, use an attribute.
+     */
+    fun logout(player: Player)
+}

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

@@ -0,0 +1,10 @@
+package api
+
+import rs09.game.system.SystemLogger
+
+interface ShutdownListener {
+    /**
+     * NOTE: This should NOT reference nonstatic class-local variables.
+     */
+    fun shutdown()
+}

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

@@ -0,0 +1,10 @@
+package api
+
+import rs09.game.system.SystemLogger
+
+interface StartupListener {
+    /**
+     * NOTE: This should NOT reference nonstatic class-local variables.
+     */
+    fun startup()
+}

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

@@ -0,0 +1,11 @@
+package api
+
+interface TickListener {
+    /**
+     * NOTE: This should NOT reference nonstatic class-local variables.
+     * TickListeners are generally for NON-player, WORLD tick events.
+     * Examples: Fishing spot rotation, grand exchange updates, puro puro randomization, etc.
+     * If you need something (player/entity)-specific, use an [api.events.EventHook] with the [api.events.TickEvent]
+     */
+    fun tick()
+}