Changes Made:
Added particle effect system.
Added particle effect, "Fire Ring" to act as the explosion.
Still working on the explosion animation, if you want to see the current "Fire Ring" animation,
just uncomment the particle effect variable in the render function of the Game Screen.
Merge branch 'master' of https://github.com/aSaul2006/SpaceStar_5
Error found:
When enemy is being destroyed, its shutdown function is called twice.