update: 更新到godot4.4.1，并大量重构代码

Scripts/Utilities/JsonConfig.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.IO;
+using System.Text.Json;
+
+public class JsonConfigManager : IConfigManager {
+    private string? filePath;
+    private Dictionary<string, object> config = [];
+    private Dictionary<string, object>? defaultConfig;
+
+    public T GetValue<T>(string key) {
+        if (config.TryGetValue(key, out object? val)) {
+            if (val is T t) {
+                return t;
+            } else if (val is JsonElement element) {
+                return element.Deserialize<T>() ??
+                    throw new InvalidCastException($"无法将键'{key}'的值转换为类型{typeof(T).Name}");
+            }
+        }
+        if (
+            defaultConfig != null &&
+            defaultConfig.TryGetValue(key, out object? dval) &&
+            dval is T ret) {
+            return ret;
+        }
+        throw new KeyNotFoundException($"Key '{key}' not found in config.");
+    }
+
+    public bool HasKey(string key) => config.ContainsKey(key);
+    public void SaveToFile() {
+        ArgumentException.ThrowIfNullOrWhiteSpace(filePath);
+        File.WriteAllText(filePath, JsonSerializer.Serialize(config));
+    }
+
+    public void LoadFromFile() {
+        ArgumentException.ThrowIfNullOrWhiteSpace(filePath);
+        if (!File.Exists(filePath)) {
+            return;
+        }
+        config = JsonSerializer.Deserialize
+            <Dictionary<string, object>>(File.ReadAllText(filePath)) ?? [];
+    }
+
+    public void SetDefault(Dictionary<string, object> defaultConfig) => this.defaultConfig = defaultConfig;
+
+    public void SetFilePath(string filePath) => this.filePath = filePath;
+
+    public void SetValue(string key, [NotNull]object? value) {
+        ArgumentNullException.ThrowIfNull(value);
+        config[key] = value;
+    }
+}