Update LiveSplit.AutoSplitters.xml to add SKALD

[primitiveType]

• Add SKALD: Against the Black Priory Autosplit

If you are adding or modifying an Auto Splitter, please fill out this checklist:

• [ X] My Auto Splitter does not contain any malicious functionality and I'm entirely responsible for any damages myself. (Any kind of abuse in an Auto Splitter will result in an immediate ban.)
• [ X] I am not replacing an existing Auto Splitter by a different author, or I have received permission from the author to replace the existing Auto Splitter.
• [X ] The Auto Splitter has an open source license that allows anyone to fork and host it.