Full support for embed arrays in .greet/.bye, .say and other commands which use embeds

- Website to create them is live at eb2.nadeko.bot (it will soon be replacing eb.nadeko.bot)
- Embed arrays don't have a plainText property (it's renamed to 'content')
- Embed arrays use color hex values instead of an integer
- Old embed format will still work
- There shouldn't be any breaking changes

src/NadekoBot/Services/Impl/BotCredsProvider.cs

@@ -53,9 +53,8 @@ public sealed class BotCredsProvider : IBotCredsProvider
         _config = new ConfigurationBuilder().AddYamlFile(CredsPath, false, true)
                                             .AddEnvironmentVariables("NadekoBot_")
                                             .Build();
-#if !GLOBAL_NADEKO
+        
         _changeToken = ChangeToken.OnChange(() => _config.GetReloadToken(), Reload);
-#endif
         Reload();
     }