Compilation issues when the InputSystem is enabled

[lukasreuter]

When the InputSystem package is present in a project adding this SDK creates a couple of compilation issues that stem from not having the right packages included in the asmdef.

Also the package version of this SDK was never updated and still shows 2.3.0 instead of the actual package version.

The package also has compilation issues if the Steam SDK is disabled (with the define DISABLESTEAMWORKS).