Added particles to molten

Destroying the particles when the unit dies is missing, same as the
explosion

I changed some parts of the molten code (100 distance traveled is now
50, and radius for the damage is 100 instead of 400) to better adjust
the particle.

I also removed the Repeat - Until that was crashing the game if
traveling a long distance in one go (the developer blink)

Particle needs test, as it can cause fps issues
http://puu.sh/dB6ZH/edacb64bd1.jpg