Make resources.Get use a file cache for remote resources.

[bep]

As I mentioned briefly, I'm in the process of improving some core things in Hugo (including some cache work), but I think we should get the recent remote support in resources.Get + XML support out in its own Hugo release.

To do that, I think we should make the remote resources.Get cache to disk and not to memory (as it is now).

See:

https://github.com/gohugoio/hugo/blob/master/tpl/data/resources.go#L47

I suggest that we set up a new named file cache, name it getresource, and update the docs about it here:

https://gohugo.io/getting-started/configuration/#configure-file-caches

Perhaps make a note about its usage in resources.Get but only for remote resources.

@vanbroup something you would want to take on and implement?

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