Feature: Auto-Indenting as you type

[alistairjevans]

It would be good to apply 'best practice' layout control on AutoStep files (if a user enables the feature),
to automatically format the document as people type.

This includes (but not limited to):

• Indenting Scenarios at the expected level.
• Keeping Given/When/Then step indentation consistent.
• Indenting 'And' steps on the line immediately after the previous one so the first token after the step type keyword lines up with the original step.
• Aligning comments above a line to the same indentation as the line below
• Indenting description blocks.

Things to consider:

• How to make this available as a setting?
• Make indentation character and count configurable? Tabs vs Spaces anyone?

[alistairjevans]

As a guide, the AutoStep core library may need to expose some additional functionality to help with this. In fact, a general 'reformatter' should probably be added to the core to help with a variety of tasks we will want to accomplish, like reformatting tables, refactoring tests, and so on.