feat!: GetRequiredBehaviour/HierarchyObject methods added for cleaner null handling

Engine.Core/BehaviourBase.cs

@@ -1,5 +1,6 @@
 using Syntriax.Engine.Core.Abstract;
 using Syntriax.Engine.Core.Exceptions;
+using Syntriax.Engine.Core.Helpers;
 
 namespace Syntriax.Engine.Core;
 
@@ -69,9 +70,8 @@ public abstract class BehaviourBase : BaseEntity, IBehaviour
 
     protected override void InitializeInternal()
     {
-        base.InitializeInternal();
-        NotAssignedException.Check(this, _behaviourController);
-        NotAssignedException.Check(this, StateEnable);
+        AssertHelpers.AssertBehaviourControllerAssigned(this);
+        AssertHelpers.AssertStateEnableAssigned(this);
     }
 
     private void OnStateEnabledChanged(IStateEnable sender, bool previousState) => UpdateActive();