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/ExampleAss/Axe.asset

@@ -12,6 +12,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 951b5c8af5114086a865d4bb7eae4548, type: 3}
   m_Name: Axe
   m_EditorClassIdentifier: 
+  _itemId: axe_bf031e9e
   itemName: Axe
   description: Well... how do you like 'em?
   mapSprite: {fileID: 6674386295937086461, guid: 3bd1c178a78fcd144965cd1731dc309b, type: 3}