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/Scenes/Levels/AppleHillsOverworld.unity

@@ -1979,6 +1979,10 @@ PrefabInstance:
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       value: 0
       objectReference: {fileID: 0}
+    - target: {fileID: 7852204877518954380, guid: 8ac0210dbf9d7754e9526d6d5c214f49, type: 3}
+      propertyPath: maxSpeed
+      value: 15
+      objectReference: {fileID: 0}
     m_RemovedComponents: []
     m_RemovedGameObjects: []
     m_AddedGameObjects: []