Fix compilation error in Xcode 13

Conform File to ReflectionDecodable/Equatable (#212)

Use NIO's primitive functions for flatMap and its siblings. (#211)

* Use NIO's primitive functions for flatMap and its siblings.

Also fixes a stack overflow in case of many nested flat maps (see the tests). Plus, it speeds up `testFlatMapPerformance` by about 20%.

* Bump test swift version to 5

* Fix JWT tests and revert to Swift 4.2

* Update redis tests

xcode 11 file fixes (#208)

iOS integration through SPM and Xcode 11 (#206)

Use NIO's `whenAll` for `Collection`.flatten now. (#203)

Fix file extension (#198)

* Fix file extension

* Rename variable

Significantly improve the performance of `Collection<FutureType>.flat…

…ten (#199)

* Significantly improve the performance of `Collection<FutureType>.flatten`.

This further halves the runtime in vapor/template-kit#50 from 0.1s to 50ms.

* Add a benchmark for `flatten`.

swift 5 #compiler check (#197)

Swift 5 updates (#196)

* Swift 5 updates

* support old hashable

* revert hash fixes