- Update the AWS provider.
- Use the common tags option in the provider and improve tagging usage.
- Address a few warnings from the updated provider.

Mostly ignore things I'm not interested in but it did find somethings.

AWS' SMS delivery has been unreliable to say the least. Replace it with
Twilio but that's more complex:

- A new Lambda function to send SNS messages as SMS messages with
  Twilio.
- Add the function as a subscription to the SNS topic.

Plus subscriptions and IAM policy to publish messages.