Spawning with delay while in a "Paused" state

[Josh015]

Could you add a way to pause all the countdowns for spawns that have delays? Maybe a way based on the game's current state?

For example, in my little pong game I have balls that all spawn from the same spot at the center of the arena with a small delay to keep them from all spawning together. Currently I have an issue where when I pause the game they continue to count down their delays and then get stuck inside each other when they spawn.
https://github.com/Josh015/bevy-crab-pong