Easier tools for reading/setting/getting keys

[kevinburke]

Hi,
I'm interested in writing a program to update a config file, while preserving the comments in that file. This requires calling ParseBytes() or equivalent and then manipulating the resulting *ast.File. This is a little cumbersome. I added some helpers for getting/setting keys, in this gist:

https://gist.github.com/kevinburke/477ca3a49d67f886cd2ade96a2abaf2a

They assume the data has a little more structure than HCL provides - no listing two keys for a given ObjectList for example. But they significantly simplify the task of manipulating the AST, which is why I thought you might be interested in adding something like this to the project.