C4 now explodes on detonation, Stechtkin pistol fix

The Stechtkin pistol now works properly, C4 will now create a small
(Welder tank) sized explosion upon being detonated.
Misc. changes
Nukeops Weapons Rework

Nukeops now start with a Stechtkin Pistol instead of the C-20r.
In addition, they now have more items available to purchase in their
uplink (Exclusive to Nukeops). They are as follows:
C-20r - 6TC
L6SAW - 10TC
C-20r Mag - 1TC
L6SAW Mag - 3TC
Stechtkin Silencer - 1TC
Advanced Medkit - 3TC

The prices are, of course, subject to change as we observe further
Nukeops rounds.
Bullet damage tweaks

Upped the L6's bullet damage due to how high the cost of it is. Subject
to change, as always.
Merge pull request #194 from SamCroswell/master

Nukeops Weapons Rework