[Feedback] Zombie Timer feature for the Pick a Plant Update

The timer of spawning zombies is visible in the level progression bar. Most of the time it's consistently changing depending on the level.

Here's how the timer should probably work:

1 Flag Level: The timer is fast, not too fast, but decently fast.

2 Flag Level: The timer is normal speed, a medium pacing 

3 Flag Level: The timer is slow, not too slow like a turtle, just slow enough so you have time to place things.

The timer's speed varies depending on how quickly you defeat zombies, especially when a whole group of them are defeated at once (Summoned Zombies, like Pigeons and Backup Dancers do not count, they should count to their Summoners like Disco Zombie and Pigeon Feeder, or if the Summoner dies first, it counts it as defeated until all summoned zombies from said summoner are defeated. Thrown Imps from Gargantuars also count in this scenerio.)

Beginning of Level Timer should be visible, Zombies are approaching in: INSERT TIMER HERE

This can help especially with players who are new to the franchise. This zombie timer doesn't have to be added now, you guys over at Popcap should worry about the big stuff with your first major content update.