Parser now creates lists only when it is necessary

ParadoxSaveParser.WebAPI/SaveDataFilters/ISaveDataFilter.cs

@@ -5,5 +5,5 @@ public interface ISaveDataFilter
     public string SearchString { get; }
     public ISearchExpression SearchExpression { get; }
     
-    public void Apply(Dictionary<string, List<object>> data);
+    public void Apply(Dictionary<string, object> data);
 }

ParadoxSaveParser.WebAPI/SaveDataFilters/SaveFilterEU4.cs

@@ -1,5 +1,5 @@
 using System.Linq;
-using ParsedDict = System.Collections.Generic.Dictionary<string, System.Collections.Generic.List<object>>;
+using ParsedDict = System.Collections.Generic.Dictionary<string, object>;
 
 namespace ParadoxSaveParser.WebAPI.SaveDataFilters;
 
@@ -38,12 +38,11 @@ public class SaveDataFilterEU4 : ISaveDataFilter
     
     public void Apply(ParsedDict data)
     {
-        var countries = (ParsedDict)data["countries"][0];
+        var countries = (ParsedDict)data["countries"];
         var countries_filtered = countries.Where(pair 
-            => pair.Value.Count > 0 
-               && ((ParsedDict)pair.Value[0]).TryGetValue("raw_development", out var raw_development)
-               && (double)raw_development[0] > 0
+            => ((ParsedDict)pair.Value).TryGetValue("raw_development", out var raw_development)
+               && (double)raw_development > 0
             ).ToDictionary();
-        data["countries"][0] = countries_filtered;
+        data["countries"] = countries_filtered;
     }
 }