Adds Monadnock PR-24 Control Baton

The Monadnock PR-24 replaces the generic tonfas used by law enforcement officers. A high-end, collapsible, lightweight, side-handle police baton, this is the gold standard for officer safety and effective crowd control.

This PR also replaces the shock tonfas in the cop_weapons spawn list with actual tazers, which they did not have before and would likely use instead of a cobbled-together amalgam of 3 different tools.
I was using [this review](http://snallabolaget.com/?p=937) for the stats, which says it's 18 oz.

[Here's another,](http://www.copquest.com/25-2110_monadnock-pr-24-control-device.htm) [and another.](http://www.policeproducts.com/monadnock-pr24-positive-lock-epoxy-baton-p-1907.html)