Improved F# templates

[ghost]

Issue #, if available: N/A

Description of changes:

This PR aims to improve the F# templates by:

• formatting the code as recommended by the F# style guide;
• using F# idiomatic constructs where appropriate.

Progress tracking:

• Lambda Detect Image Labels
• Lambda Empty Function
• Lambda Simple DynamoDB Function
• Lambda Simple Kinesis Function
• Lambda Simple S3 Function
• Lambda ASP.NET Core Web API
• Serverless Detect Image Labels
• Lambda Empty Serverless
• Lambda Giraffe Web App
• Serverless Simple S3 Function
• Step Functions Hello World

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ghost]

My apologies for the nonsensical initial comment — my keyboard went wacky —, as well as for the many edits — for some reasons the Markdown preview was not working in my browser…

[normj]

Awesome, I appreciate the help. My F# skills are at the learning stage. I'm traveling now but later this week I can take a deeper look into the changes.

[ghost]

No need to hurry, it will be some weeks before I finish reviewing all templates. Currently, my changes consist mostly in removing C# leftovers.

I am no F# expert but I'm glad if I can help. 🙂

[ghost]

@normj There is still room for further improvements but I think I'm done with this PR, could you please review it?

[normj]

Thanks I'll take a look soon. I'll have to merge it into another release we have coming very soon which affects the blueprints.

[normj]

Version 3.2.0 of Amazon.Lambda.Templates and version 1.14.4 of the AWS Toolkit for Visual Studio went out with these changes as part of today's .NET Core 2.1 release.