Thermite Effectiveness Scaling with Volume and Wall Type

Poll: http://tgstation13.org/phpBB/viewtopic.php?f=14&t=222

-The more thermite is applied to a wall, the faster it will burn
-Scales between approx 10-25 seconds
-Rwalls require 4x more thermite
-Applying thermite to a wall now leaves a visible stain on the wall
-Igniting thermite makes a sound