Avoid unnecessary force-unwrapping or nil-coalescing

[blochberger]

There is a lot of unnecessary force-unwrapping or nil-coalescing in the code, e. g.:

cwa-app-ios/src/xcode/ENA/ENA/Source/Developer Menu/DMSubmissionStateViewController.swift

Line 120 in e4a9d32

static let binHeader = "EK Export v1 ".data(using: .utf8)!

or

cwa-app-ios/src/xcode/ENA/ENA/Source/Workers/Hasher.swift

Line 24 in e4a9d32

let value = SHA256.hash(data: input.data(using: .utf8) ?? Data())

The conversion from String to UTF-8 encoded Data cannot fail. A non-optional conversion can be done:

let string: String = "foobar"
let data: Data = Data(string.utf8)

[tkowark]

Thanks for the enhancement proposal, @blochberger !

As the team is working full steam towards the planned release, it would help us a lot, if you could give us some more information about the potential benefits of your proposal. Ideally, you can follow (and in the future use) the respective template.

The background simply is that we have to pick wisely, which improvements to implement now, and which ones to tackle in a future release. To better assess that, just a rough outline of the expected benefits (readability, error-proneness, performance, etc.) would really be of huge assistance!

[ChristianKienle]

will be fixed by #402. Thank you very much for pointing out those unnecessary forced unwraps / default values.