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/Editor/AppleHillsEditor.asmdef

@@ -4,7 +4,9 @@
     "references": [
         "GUID:d91d3f46515a6954caa674697afbf416",
         "GUID:69448af7b92c7f342b298e06a37122aa",
-        "GUID:9e24947de15b9834991c9d8411ea37cf"
+        "GUID:9e24947de15b9834991c9d8411ea37cf",
+        "GUID:70ef9a24f4cfc4aec911c1414e3f90ad",
+        "GUID:d1e08c06f8f9473888c892637c83c913"
     ],
     "includePlatforms": [
         "Editor"