[FIX] Lowered weapon shooting fix for HL2.

[celisej567]

Almost all shooting weapons uses CBaseHLCombatWeapon as a base. Lowering system coded in there. But the Attack code are in CBaseCombatWeapon instead. And lowered weapon, that should not fire, still fires, because CBaseCombatWeapon class dont know is weapon lowered or not.

I fixed it by moving SERVERSIDE m_bLowered and m_flRaiseTime from CBaseHLCombatWeapon to CBaseCombatWeapon. I think this way of fixing this bug is ok, because even tho CBaseCombatWeapon doesnt to do any calculations and checks for lowering weapon, it still have Lower() and CanLower() functions. They just always return false. To prevent anything bad happening for weapons that doesn't use lowering system, i didn't change this functions.

Also i manually fixed it in shotgun. There is their own Attack code.