Making Glock accept silencer and autolathe emaggable to build silencers

Made the silencer fit on the Glock (Glock has new typepath).
Made the Autolathe emaggable.
Emagged Autolathe can now build silencers (costs 200k metal, which means the Autolathe needs to be upgraded some).
New sprites for Glock so it can fit the silencer:
![New Glock sprites](http://i.imgur.com/Gk8kQpu.png)