Replace repeating timer implementation

Shared/RepeatingTimer.swift

@@ -1,54 +0,0 @@
-import Foundation
-
-final class RepeatingTimer {
-    let timeInterval: TimeInterval
-
-    init(timeInterval: TimeInterval) {
-        self.timeInterval = timeInterval
-    }
-
-    private lazy var timer: DispatchSourceTimer = {
-        let t = DispatchSource.makeTimerSource()
-        t.schedule(deadline: .now() + self.timeInterval, repeating: self.timeInterval)
-        t.setEventHandler { [weak self] in
-            self?.eventHandler?()
-        }
-        return t
-    }()
-
-    var eventHandler: (() -> Void)?
-
-    private enum State {
-        case suspended
-        case resumed
-    }
-
-    private var state: State = .suspended
-
-    deinit {
-        timer.setEventHandler {}
-        timer.cancel()
-        /*
-         If the timer is suspended, calling cancel without resuming
-         triggers a crash. This is documented here https://forums.developer.apple.com/thread/15902
-         */
-        resume()
-        eventHandler = nil
-    }
-
-    func resume() {
-        if state == .resumed {
-            return
-        }
-        state = .resumed
-        timer.resume()
-    }
-
-    func suspend() {
-        if state == .suspended {
-            return
-        }
-        state = .suspended
-        timer.suspend()
-    }
-}