add XEH support to WeaponHolder(Simulated)

[commy2]

When merged this pull request will:

• title

["WeaponHolder", "InitPost", {
    systemChat str ["WH", _this];
}] call CBA_fnc_addClassEventHandler;

["WeaponHolderSimulated", "InitPost", {
    systemChat str ["WHS", _this];
}] call CBA_fnc_addClassEventHandler;


["WeaponHolder", "Deleted", {
    systemChat str ["WH del", _this];
}] call CBA_fnc_addClassEventHandler;

["WeaponHolderSimulated", "Deleted", {
    systemChat str ["WHS del", _this];
}] call CBA_fnc_addClassEventHandler;

Open inventory
-> WH

Close Inventory (without dropping a weapon)
-> WH del

Drop Item and then Close Inventory
-> nothing (WH survives)

Kill a person
-> WHS

Take their weapon (when not having one yourself)
-> WHS del