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/Data/Items/SoundBirdPuzzleItems/Headband.asset

@@ -12,6 +12,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 951b5c8af5114086a865d4bb7eae4548, type: 3}
   m_Name: Headband
   m_EditorClassIdentifier: 
+  _itemId: headband_9a56f411
   itemName: Headband
   description: Item dropped by Uncle Kunt!
   mapSprite: {fileID: 743298078511449570, guid: 6f463983177b1404ca39fa222f03a3b2, type: 3}