Reduce compound spawns while the player is stationary

[hhyyrylainen]

to not make it too OP

I would implement it with a variable tracking how much the player has moved, if the player has not moved much for a while I'd start to reduce the chance that compound clouds are spawned.

[Straywind]

I'll try this

[hhyyrylainen]

Well we now got code that will stop all spawns if the player is too stationary, which I guess is at least partly addressing the problem with this, though I still would have liked to see an exponentially reducing spawn rate for compounds while stationary, while still spawning microbes up to the game entity limit.

[Maxonovien]

I think that such a change would not be much of an issue, given that I have a count of entity e, the cap c, so you'd have to apply a factor exp(c-e) (with clamping to safeguard things) to the spawner trials. So I think what you want can be pretty well expanded over my PR.