allow configuration of stack submit answers

[SamSokolin]

I'd like to be able to pre-populate the answers for template, body, etc. w/o being prompted.

[abhinav]

So there's --fill to skip all prompts, but that will use your commit message as the body, no template.

I think it makes sense to support repo-level configs (with git config) that let you say:

• always use draft/no-draft for new submissions
• always use [name] as the template
• always use commit message for title and body

Is that along the lines of what you're thinking?