Fixed some crashes in response strings source generator, reorganized more submodules into their folders

src/NadekoBot/Modules/Games/Trivia/TriviaQuestionPool.cs

@@ -0,0 +1,43 @@
+#nullable disable
+namespace NadekoBot.Modules.Games.Common.Trivia;
+
+public class TriviaQuestionPool
+{
+    private TriviaQuestion[] Pool
+        => _cache.LocalData.TriviaQuestions;
+
+    private IReadOnlyDictionary<int, string> Map
+        => _cache.LocalData.PokemonMap;
+
+    private readonly IDataCache _cache;
+    private readonly int maxPokemonId;
+
+    private readonly NadekoRandom _rng = new();
+
+    public TriviaQuestionPool(IDataCache cache)
+    {
+        _cache = cache;
+        maxPokemonId = 721; //xd
+    }
+
+    public TriviaQuestion GetRandomQuestion(HashSet<TriviaQuestion> exclude, bool isPokemon)
+    {
+        if (Pool.Length == 0)
+            return null;
+
+        if (isPokemon)
+        {
+            var num = _rng.Next(1, maxPokemonId + 1);
+            return new("Who's That Pokémon?",
+                Map[num].ToTitleCase(),
+                "Pokemon",
+                $@"https://nadeko.bot/images/pokemon/shadows/{num}.png",
+                $@"https://nadeko.bot/images/pokemon/real/{num}.png");
+        }
+
+        TriviaQuestion randomQuestion;
+        while (exclude.Contains(randomQuestion = Pool[_rng.Next(0, Pool.Length)])) ;
+
+        return randomQuestion;
+    }
+}