Projéctile animation is shared among all of them

[kolumb]

Steps to reproduce:

1. Change config variable ENTITY_COOLDOWN_WEAPON to 0.01
2. Enter step-debug mode
3. Shot
4. Press X
5. Repeat from step 3

Observed

All projéctiles have the same frame. It's not that much noticeable in Idle state. But it's bad for Poof state: in regular gameplay you not always see poof animation.

Expected

Separate animation cycles for each projéctile.

[kolumb]

Solved by #298

[rexim]

@kolumb thank you so much for checking it! Forgot to drop a comment here! :D