Use different collision shapes for ship vs wall and ship vs bomb

[danneu]

It feels better with a small hitbox when a ship is navigating between walls and tight spaces where the hitbox is somewhat smaller than the ship graphic.

It also feels better when the bomb vs wall hitbox is smaller than the graphic so that the bomb can be shot through gaps.

But ship vs bomb hitboxes (on both sides) should be the size of the graphic, else it feels weird.

To do this, I'd have to add two shapes to ships and bombs, one for wall collisions and one for player/bomb collisions.