40mm launcher/ammo improvements

[Frank_Stein]

Some advanced rounds for the armory:

• Riot gas that acts like the smoke rounds with the addition of itching
  
• Net rounds, which apply a net over the target, severely slowing them. Nets can be slowly removed by resisting, or quickley removed by cutting them with a sharp object.
  
• Tracker rounds, which implant themselves into the target. Not only does it allow them to be tracked like normal tracking implants, it also emits a flashing light, and periodically beeps.