Added easier to use GetMaxHealth stock for health+ upgrade

Added proper active query callbacks to upgrades
Added more health changing upgrades
Added ammo resupply upgrade
Added natives and forwards to allow more control over effects of upgrades

Native: SMRPG_ResetUpgradeEffectOnClient to reset some upgrades effect
Forward: SMRPG_OnUpgradeEffect allows to stop an upgrade to run its
effect
Added two movement speed modifying upgrades

Frost Pistol overrides the Impulse effects and stops impulse from
working when a player was frozen.
Fixed sound precaching for frost pistol

Add SDKHooks on clients when late loaded
Added more upgrades
Added weapon denial upgrade to keep weapons after death