PK3 symlink support
Xonotic makes usage of in-PK3 symbolic link to deduplicate files in distributed game, it’s a feature implemented in Darkplaces engine. This feature is also supported by the Dæmon engine.
NetRadiant level editor and q3map2 map compiler now supports them. This was one of the things preventing to edit map against released Xonotic assets. The other missing thing required to ditch the Xonotic mapping package is the support of the dds/ prefix, that will be addressed later.
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