Create a simple dialogue authoring system, tied into our items (#10)

- Editor dialogue graph
- Asset importer for processing the graph into runtime data
- DialogueComponent that steers the dialogue interactions
- DialogueCanbas with a scalable speech bubble to display everything
- Brief README overview of the system

Co-authored-by: AlexanderT <alexander@foolhardyhorizons.com>
Co-authored-by: Michal Pikulski <michal.a.pikulski@gmail.com>
Reviewed-on: #10

Assets/Scripts/PuzzleS/ObjectiveStepBehaviour.cs

@@ -95,7 +95,7 @@ namespace PuzzleS
             if (success)
             {
                 Debug.Log($"[Puzzles] Step interacted: {stepData?.stepId} on {gameObject.name}");
-                PuzzleManager.Instance?.OnStepCompleted(stepData);
+                PuzzleManager.Instance?.MarkPuzzleStepCompleted(stepData);
             }
         }
     }