Release 13.0.0

Feature: Updated to Steamworks SDK 1.46
Feature: Improved support for Unity 2019.2
Feature: Automatically disabled on non-Steam supported platforms

Fixed: ISteamInventory_GetItemDefinitionIDs properly uses ref instead of out.

The prebuilt "Standalone" package is for non-Unity .NET applications ONLY.
Get the .unitypackage if you are using Unity.