Option to alter the default save location of tempRunnerFiles

[TheBrenny]

(Dupe of #652, but that issue has nothing in it)

Is your feature request related to a problem? Please describe. When I run a file that I haven't saved (because it's just a notepad of sorts), the tempCodeRunnerFile.lang is defaulted to the root of the first workspace. This is awkward because I don't want to commit this file, and I also don't really want to .gitignore it either, because that's an opinion.

Describe the solution you'd like I'd like my temp file to be saved to a location of my choice (and 1 up, using a filename pattern of my choice). This shouldn't be synced because it's platform dependant (ie /tmp/ won't be found on a Windows system, and %temp% won't be found on a *nix system).