Update egg-space-engineers--torch-server.json

[marnason]

Added support for changing world name, and updated the JSON configuration.

Description

I noticed some dead ends in the JSON representation of configuration files, so I fixed them and added support for changing World Name. I also let Server Description be nullable.

It doesn't seem to be possible to set variables in paths in the JSON, so I guess we need to keep the "World" folder name.

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• [X] Have you followed the guidelines in our Contributing document?
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