Remove singleton?

[eonist]

Singletons can be a source of tight coupling and testing difficulties.
Improvement:
Provide a way to inject dependencies or consider using protocols to allow for easier testing and decoupling.

protocol CrashHandling {
        func setUpCrashHandler()
        func processCrashReport()
        var sendCrashReportToServer: (([String: String]) -> Void)? { get set }
    }

    class Crashlytic: CrashHandling {
        // Implementation
    }