[MWR] - Underwater package!

*Rivet's Substantial Aquatic Expansion*
or, 
*C:DDA Finally Learns About Water*

Seriously, did you know that prior to this PR you could have an underwater gunfight? Or that you could get in a chainsaw duel with a zombie at the bottom of a swimming pool and switch to a flaming torch when that runs out of gas? Or that you could prepare and eat a three course candlelit meal, wash it down with some wine, and then enjoy smoking a fine cigar, all while sitting at the bottom of a lake?

This fixes all of that.

Now ranged combat conducted underwater is much more difficult - most ranged weapons now suffer from an increased chance of misfiring while submerged unless they are waterproofed, and underwater range penalties are huge, unless your weapon is specifically designed to be used underwater.

And all those silly things like cooking up breakfast while on the bottom of your swimming pool? Gone.

Also, new content:

four different spearguns and ammunition - deadly underwater, virtually useless on land
firearm waterproofing mod - removes extra misfire chance for being underwater
swim fins - makes you swim faster, really hard to walk in
rebreather - powered by UPS, provides breathing gas while underwater
dive bag - water friendly bag for swimmers
dive knife - small and handy utility knife for swimmers
survivor wetsuit - a survivor suit that you can comfortably swim in