Add native support for DELTARUNE Chapters 1&2

[Cl0v3rDev]

New Engine Package Submissions

• [x] Have you followed the instructions in the build documentation?
• [x] Have you run the build locally and ensured the package allowed you to launch and play the Steam game?
• [x] Have you updated the packages.json file?
• [x] Have you ensured that there is not already a pull request or active engine package for the one you are adding?

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Title explains it. These commits add a native Linux version of DELTARUNE that I put together a while ago. Tested with SteamOS on Steam Deck.