We should add an option to paste and switch the slashes around

Nobody has claimed this yet.

This was in a mail thread earlier this week:

> Say that I copy this path
> `onecore/foo/bar/baz.dll`
>
> I want it to end up like this:
> `onecore\foo\bar\baz.dll`
>
> Or vice versa. Is there a specific keyboard shortcut that would allow me to translate the path in the clipboard to the final format easily, without having to pop into an editor and an S&R?
>

At first I was like "I mean that's kinda silly"

But I've had to copy/paste paths out of `git status` back into `del` commands a few times since then and you know what? I think this is a good idea now.

Questions:

* What do we name it?
* Do we support `\` -> `/`?
* Presumably we don't want to do this just for _paths_, since `onecore/foo/bar/baz.dll` might not be a local path we can sanitize. In fact let's not confuse this with path sanitation at all
* this is literally just `"replaceSlashes": "\"`

The issue names no source files, tests, or entry points. Start by resolving the naming and behavior questions in the issue, including whether both slash directions are supported and how the option is exposed. Done means an agreed non-path-specific slash replacement option is implemented and its behavior is verified.

Written by the indexing model from the issue text.