- Added NadekoBot.Generators projects which will contain source generators

- Implemented initial version of the response strings source generator
  - Creates a class with property names equivalent to key names in responses.en-US.json
  - Each Property has struct type (with generic type parameters matching the number of string format placeholders) for type safe GetText implementation
  - Struct types are readonly refs as they should be ephermal, and only used to pass string keys to GetText

src/NadekoBot/Modules/Games/Games.cs

@@ -51,7 +51,7 @@ namespace NadekoBot.Modules.Games
             await ctx.Channel.EmbedAsync(_eb.Create().WithOkColor()
                 .WithDescription(ctx.User.ToString())
                 .AddField("❓ " + GetText("question"), question, false)
-                .AddField("🎱 " + GetText("8ball"), res, false));
+                .AddField("🎱 " + GetText("_8ball"), res, false));
         }
 
         [NadekoCommand, Aliases]