Move the hlsl shader tasks into their own folder

[gpx1000]

Fixes #1156

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[SRSaunders]

@gpx1000 While I can't formally approve, I have tested this using both Xcode (macOS/iOS) and Visual Studio (Win 10) and it works well. Just thought you might want to know about the Xcode improvement as well, since it suffered the same top level project issue as VS (#1156).

[gpx1000]

Awesome thanks @SRSaunders. I think this should be good to go when we do our call on Monday. I typically test XCode every other week or so and Windows around the same cadence so it's easy for me to miss bugs like this. My day to day I'm in Linux.