Add delay to Explosive Barrel explosion

[iskandarzulkarnaien]

Problem: Barrels caught in the blast radius of other barrels explode immediately, potentially causing an instantaneous explosion of a large number of barrels. This is visually unimpressive and causes the explosion sound to be played n times for n barrels.

Proposed Idea: Introduce slight delay to explosion.

For Discussion: Should we add a slight randomness to the explosion delay? This will prevent the first group of affected barrels from all exploding at the same time.