NadekoBot Patronage system, Search commands improvements + fixes

src/NadekoBot/Modules/Searches/_Common/Config/ImgSearchEngine.cs

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+namespace NadekoBot.Modules.Searches;
+
+public enum ImgSearchEngine
+{
+    Google,
+    Searx,
+}

src/NadekoBot/Modules/Searches/_Common/Config/SearchesConfig.cs

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+using Cloneable;
+using NadekoBot.Common.Yml;
+
+namespace NadekoBot.Modules.Searches;
+
+[Cloneable]
+public partial class SearchesConfig : ICloneable<SearchesConfig>
+{
+    [Comment(@"Which engine should .search command
+'google' requires googleApiKey and google.searchId set in creds.yml
+'searx' requires at least one searx instance specified in the 'searxInstances' property below")]
+    public WebSearchEngine WebSearchEngine { get; set; } = WebSearchEngine.Google;
+    
+    [Comment(@"Which engine should .image command use
+'google' requires googleApiKey and google.imageSearchId set in creds.yml
+'searx' requires at least one searx instance specified in the 'searxInstances' property below")]
+    public ImgSearchEngine ImgSearchEngine { get; set; } = ImgSearchEngine.Google;
+    
+
+    [Comment(@"Which search provider will be used for the `.youtube` command.
+
+- `ytDataApiv3` - uses google's official youtube data api. Requires `GoogleApiKey` set in creds and youtube data api enabled in developers console
+
+- `ytdl` - default, uses youtube-dl. Requires `youtube-dl` to be installed and it's path added to env variables. Slow.
+
+- `ytdlp` - recommended easy, uses `yt-dlp`. Requires `yt-dlp` to be installed and it's path added to env variables
+
+- `invidious` - recommended advanced, uses invidious api. Requires at least one invidious instance specified in the `invidiousInstances` property")]
+    public YoutubeSearcher YtProvider { get; set; } = YoutubeSearcher.Ytdl;
+
+    [Comment(@"Set the searx instance urls in case you want to use 'searx' for either img or web search.
+Nadeko will use a random one for each request.
+Use a fully qualified url. Example: `https://my-searx-instance.mydomain.com`
+Instances specified must support 'format=json' query parameter.
+- In case you're running your own searx instance, set 
+
+search:
+  formats:
+    - json
+
+in 'searxng/settings.yml' on your server 
+
+- If you're using a public instance, make sure that the instance you're using supports it (they usually don't)")]
+    public List<string> SearxInstances { get; set; } = new List<string>();
+
+    [Comment(@"Set the invidious instance urls in case you want to use 'invidious' for `.youtube` search
+Nadeko will use a random one for each request.
+These instances may be used for music queue functionality in the future.
+Use a fully qualified url. Example: https://my-invidious-instance.mydomain.com
+
+Instances specified must have api available.
+You check that by opening an api endpoint in your browser. For example: https://my-invidious-instance.mydomain.com/api/v1/trending")]
+    public List<string> InvidiousInstances { get; set; } = new List<string>();
+}
+
+public enum YoutubeSearcher
+{
+    YtDataApiv3,
+    Ytdl,
+    Ytdlp,
+    Invid,
+    Invidious = 3
+}

src/NadekoBot/Modules/Searches/_Common/Config/SearchesConfigService.cs

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+using NadekoBot.Common.Configs;
+
+namespace NadekoBot.Modules.Searches;
+
+public class SearchesConfigService : ConfigServiceBase<SearchesConfig>
+{
+    private static string FILE_PATH = "data/searches.yml";
+    private static readonly TypedKey<SearchesConfig> _changeKey = new("config.searches.updated");
+
+    public override string Name
+        => "searches";
+
+    public SearchesConfigService(IConfigSeria serializer, IPubSub pubSub)
+        : base(FILE_PATH, serializer, pubSub, _changeKey)
+    {
+        AddParsedProp("webEngine",
+            sc => sc.WebSearchEngine,
+            ConfigParsers.InsensitiveEnum,
+            ConfigPrinters.ToString);
+        
+        AddParsedProp("imgEngine",
+            sc => sc.ImgSearchEngine,
+            ConfigParsers.InsensitiveEnum,
+            ConfigPrinters.ToString);
+        
+        AddParsedProp("ytProvider",
+            sc => sc.YtProvider,
+            ConfigParsers.InsensitiveEnum,
+            ConfigPrinters.ToString);
+    }
+}

src/NadekoBot/Modules/Searches/_Common/Config/WebSearchEngine.cs

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+namespace NadekoBot.Modules.Searches;
+
+public enum WebSearchEngine
+{
+    Google,
+    Searx,
+}