Scripts/SteamVault: reworked InstanceScript
Core/SAI: Get rid of unused parameter 'storageId' (third) in SMART_ACTION_SUMMON_CREATURE. This means the 4th parameter (actionInvoker 0/1) must move back one parameter. On a clean TDB there is not a single case of this parameter being used.

Updated wiki accordingly.
Merge pull request #10933 from MitchesD/SteamVault

Scripts/SteamVault: reworked InstanceScript
Core/Scripts: added some OVERRIDEs