Refactor: Fixed indentation in Bullet::bulletHit() for later commits.

It has been out of sync with logical structure which has been changed
since the logic was isolated into a function.
Fix access violation on Entity death by Bullet splash damage.

This bug has been introduced since eb36f60 as well as ExplosiveBullet's
splash damage.
Revived static and expanding disc shape variants for Teline.
Revived sprite shape for Teline3.

demo7.nut demonstrates this with Tank main gun.