Revamp the settings system (#7)

- A Settings Provider system to utilize addressables for loading settings at runtime
- An editor UI for easy modifications of the settings objects
- A split out developer settings functionality to keep gameplay and nitty-gritty details separately
- Most settings migrated out of game objects and into the new system
- An additional Editor utility for fetching the settings at editor runtime, for gizmos, visualization etc

Co-authored-by: Michal Pikulski <michal.a.pikulski@gmail.com>
Co-authored-by: AlexanderT <alexander@foolhardyhorizons.com>
Reviewed-on: #7

Assets/Editor/PuzzleChainEditorWindow.cs

@@ -9,7 +9,7 @@ public class PuzzleChainEditorWindow : EditorWindow
     private Vector2 scrollPos;
     private const int INDENT_SIZE = 24;
 
-    [MenuItem("Tools/Puzzle Chain Editor")]
+    [MenuItem("AppleHills/Puzzle Chain Editor")]
     public static void ShowWindow()
     {
         var window = GetWindow<PuzzleChainEditorWindow>("Puzzle Chain Editor");