Upgrade cats-effect to 2.1.0, add SyncEffect instance for Coeval #1117
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Since cats-effect 2.1.0 drops Scala 2.11, I have to cross-build against different versions of it.
So, SyncEffect[Coeval] is only available in 2.12+.
Also, Resource is now covariant, and it wrecks the inference in pattern-matching that we use to make Iterant and Observable out of Resource. I've changed it to use unchecked matches, but we can also just delegate to
resource.allocatedinstead of recursively decomposing it.