Handle dispatch main queue

HandledDispatchMainQueue.Swift

func dispatchAsyncOnMainQueueIfNeeded(_ block: ()-> Void) {
    if Thread.isMainThread {
        //Invoke block if already on Main-Thread, This remains the sequence of execution
        block()
    } else {
        //It's on background, dispatch the block to main queue.
        DispatchQueue.main.async(block)   
    }
}