Simplify API

[hbulens]

Merged similar classes with similar purposes and simplified the configuration. AddFacteur is the entry point and exposes an instance of the FacteurBuilder class.

serviceCollection.AddFacteur(x =>
{
    x.WithMailer(y => new SmtpMailer(credentials, y.GetService<IEmailComposer>()))
    .WithCompiler<ScribanCompiler>()
    .WithTemplateProvider(x => new AppDirectoryTemplateProvider("Templates", ".sbnhtml"))
    .WithResolver<ViewModelTemplateResolver>()
    .WithDefaultComposer();
});

For simple email workflows, no compilers, providers, resolvers or composers are required. To use the templating system and dynamic content, correct DI configuration enables the use of a new overload in the IMailer:

public async Task SendConfirmationMail(string customerMail, string customerName)
{
  await mailer.SendMailAsync(x =>  x      
      .SetSubject("Hello world")
      .SetFrom("[email protected]")
      .SetTo("[email protected]")
      .SetCc("[email protected]")
      .SetBcc("[email protected]")
      .BuildAsync(new TestMailModel { Email = customerMail, Name = customerMail }));
}

This overload exposes the composer and will build the request before sending it out. That way you don't need to resolve and instantiate an instance of the IEmailComposer class anymore, even though that's still a possibility.