Add shutdown event for `LevelCore`

sources/CoreRealm/LevelCore.uc

@@ -53,11 +53,31 @@ var private bool blockSpawning;
 //  `LevelCore`
 var private LevelCore activeInstance;
 
+var private SimpleSignal onShutdownSignal;
+
+protected function Constructor()
+{
+    onShutdownSignal = SimpleSignal(_.memory.Allocate(class'SimpleSignal'));
+}
+
 protected function Finalizer()
 {
+    _.memory.Free(onShutdownSignal);
     default.activeInstance = none;
 }
 
+/**
+ *  Signal that will be emitted when caller level core is shut down.
+ *
+ *  [Signature]
+ *  void <slot>()
+ */
+/* SIGNAL */
+public final function SimpleSlot OnShutdown(AcediaObject receiver)
+{
+    return SimpleSlot(onShutdownSignal.NewSlot(receiver));
+}
+
 public static function LevelCore CreateLevelCore(Actor source)
 {
     if (GetInstance() != none)  return none;
@@ -95,6 +115,7 @@ event PreBeginPlay()
 //  Clean up
 event Destroyed()
 {
+    onShutdownSignal.Emit();
     if (self == default.activeInstance) {
         default.activeInstance = none;
     }

sources/ServerLevelCore.uc

@@ -18,6 +18,13 @@
  */
 class ServerLevelCore extends LevelCore;
 
+protected function Constructor()
+{
+    super.Constructor();
+    //  TODO: this is hack, needs to be redone later
+    KF1_HealthComponent(_.kf.health).PresudoConstructor();
+}
+
 public static function LevelCore CreateLevelCore(Actor source)
 {
     if (source == none)                             return none;