Add support for Atziri's Splendour socketed Soul Core types

[slaren]

Description of the problem being solved:

The mod "This item gains bonuses from Socketed Soul Cores as though it was also <x>" from Atziri's Splendour is not supported.

Steps taken to verify a working solution:

• Create Atziri's Splendour item
• Change variant
• List of socketable soul cores should change accordingly
• Importing a character with Atziri's Splendour equipped through the API should also correctly recognize the socketed soul cores