Rendered projectile position should be predicted between logic ticks.

[pchote]

Fast projectiles look very jumpy, especially on slower game speeds. We can dramatically improve this by predicting the position we expect a projectile to be in at the next game tick and then smoothly lerping towards that each render frame. If the guess is wrong, then the visual jump will be no worse than what we have now.

Note: this ticket only covers projectile position prediction, which is a relatively simple and self-contained task. Predicting actor positions is a much harder problem that should be considered separately.