Almost Fixed Submachine Gun

Making the best out of the default submachine gun, this skin does the following:

+ It ejects VALVe's rifle shells instead of pistol shells.

+ It scales down the rifle shells to sixty-eight percent of their original size.

+ It replaces the view model texture with the one from the leak (for consistency).

+ It replaces the world model laser sight with the view model's (for consistency).

+ Its origins mimic those of Half-Life's MP5.

+ It fixes the muzzle flash origins of the view model.

The only fix missing is from the world model. Crowbar would not decompile that model, so this skin does not fix the world model's shell ejection.