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Useable "Stunstick" for HL2

Add the weapon script txt for "weapon_stunstick_player" entity that newly added from 20th anniversary update, or auto execute command "stunstick_pickupable 1" for pickup the original stunstick that metropolices used.

Seems Valve was also planned to bring Half-Life 2: Deathmatch into the main game, but being canned for unknown reason. This stuntsick was supposed to be used for that but remain unused.

* type sv_cheats 1 / give weapon_stunstick_player in console for using the weapon, or just make a map that include this entity to obtain.

* all metropolices are using "weapon_stunstick" which would originally being used as hevsuit's battery, if set stunstick_pickupable to 1, their stunsticks can be pick up as a useable weapon.

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