Drop iOS/tvOS 9-11, watchOS 3-4, macOS 10.10-10.13 support#1605

Merged

designatednerd merged 7 commits intomainfrom

drop/ios-9-thru-11

Jan 11, 2021

Commits on Jan 4, 2021

Update min iOS version to 11.0 + simultaneously released versions of other platforms
designatednerd
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remove unused file
designatednerd
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Remove check for macOS 10.13 since that's now our min version
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Get rid of now-unnecessary workaround and extra tests for stable json representation
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get rid of now unnecessary availability guards in the URLSessionClient
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get rid of workarounds checking if data can be sorted in tests
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actually, 11 runs on all the same devices as 12, so...let's bump everything to 2018 relases
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