Weapon fix pack for STRAIN, version 1 file

Weapon fix pack for STRAIN changing:
1) Initial bullet number from 0 to 10, equal to standard clip pickup, giving the player a proper pistol start, not very different from STRAIN's fist start gameplay-wise though.
2) Fists with their double punches to look more smooth and true to life (in fact just flipping and renaming the sprites to rearrange them).
3) Chaingunner firing sound to the same as the player's and removing the extra tic for 'target check' that made ID give this enemy the shotgun firing sound Doomworld.com Now the chaingunner fires more smoothly and is a bit more lethal. This is contained in the CPOS-BUL.DEH patch by Myk from Doomworld (see thread).