Re-add CraftBukkit's deprecation mappings

[ghost]

Description

Re-adds CraftBukkit's deprecation mappings

Additional comments

I haven't tested this, but it's exactly the same from CraftBukkit's deprecation mappings so it should work just as fine. I also haven't added the deprecation-mappings.at file however it doesn't seem to be needed since it just makes it synthetic and CraftBukkit also removes it in 1.9

Checklist:

• [x] I have reviewed my code thoroughly.
• [ ] I have tested my code.
• [x] My changes generate no new warnings