Quake sound replacer

While playing the game with surround sound on, probably slightly too loud, the first time my character froze up when they got caught in a quake, I thought they were on the receiving end of mortar fire and actually looked around for explosion impacts. The sound was twice as loud as anything I'd previously experienced in the game and nothing like what I'd expect a quake to sound like.

This replaces the initial quake impact sound with a more tremor-like audio rumble which seems much closer to what I'd imagine a quake sounding like and less like you're being used for target practice.

I converted an example of the quake sound into a standard .wav format most audio players can read and uploaded it to the optional download area for those that want to preview it prior to install.