Adds a new planet, Tenebris, a dark planet enshrouded in a thick acidic atmosphere. Fork of the original Tenebris mod. Only a few changes have been made so far, but if you have ideas, feel free to issue a pull request.

Features:
- Added space connection between Tenebris and Solar system edge.
- Replaced custom cargo drop technology with PlanetsLib-derived cargo drop technology.
Balancing:
- Removed the ability to add quality modules to biobeacons, to increase differentiation between Maraxsis' conduit and Tenebris' biobeacon.
Graphics:
- Replaced bio-luminescent science pack graphics with higher resolution, mipmapped versions.

Original Mod: https://mods.factorio.com/mod/tenebris