Mini Balance Update

In accordance with voted-on changes from the Battle Grounds Discord, the following changes have been made:

• Snipers now move at the default speed when reloading, as opposed to being slower than other classes.

• Buffed the Blunderbuss weapon: its damage by 10%, and its accuracy by about 20%.

• Added a cvar, sv_jumpshooting, which when set enables full weapon accuracy when ironsighted+jumping

• To support experimentation with the Grenadier class, added the cvars sv_grenade_damage_multiplier and sv_grenade_range_multiplier.