Add auto-indentation for multi-line text within snippets

[onecrayon]

Currently only the first line of the text is indented the proper amount for a multi-line snippet.

[onecrayon]

I'm bumping this back to "potential" instead of a 1.0 feature because it's going to be somewhat tricky to implement. Covering scenarios such as mixed indentation, how to parse based on indentation of snippet vs. indentation of text, etc. are all going to make this more complicated than I originally thought.

[onecrayon]

This isn't my problem anymore, now that Espresso automatically indents snippets and pasted code.