Support on Static Routes to flag them as "Download Only"

[Badgerati]

Static routes at the moment only support rendering of static content. This enhancement is to have some -DownloadOnly switch which, when supplied, will flag a specific static route to instead attach it's files (for downloading) instead of rendering them.

Idea:

route static '/images' './my-images' -do

This way if someone hit http://localhost/images/cats/fluffy.png, then the fluffy.png image is downloaded instead of rendered in the browser.

• If a static route is enabled for downloading only, then default files are not respected - the path supplied must be whole.
• Caching is not used (it's not supported on the attach function anyway, but just ensuring).