Unspent shells now yield titanium, aluminium and steel when deconstructed instead of just steel

Corrected a typo and improved the inventory icon sprite

Added aluminum to fabrication recipe and greatly increased damage to justify resource cost. It now takes 3 shots to kill a moloch with our without shell, the projectile is also nearly lethal after penetrating 1 wall and reliably incapacitates after 2.

Fixed inventory icon