Unique sounds for WK Screech and Hour of the WK (!378)

Description

Add uniques sounds for WK screech and WK hour

 

Changelog

General
- Witch-King Screech and Hour powers now have an unique sound

 

Checklist

I have:

• Tagged my change with the ;,; comment block.
• Ensured that this merge request changes exactly one thing.
• Attached the proper labels to this merge request.
• Added the Merge Request number in the title. e.g. (!42)
• Tested my code.