Spidertron Tiers SA

This is an updated fork of Spidertron Tiers (Community Updates) with improved mod compatibility and Space Age support.

Changes from the original:
- Full Space Age compatibility: spidertrons are tiered by planet (Prototype → Nauvis, Assault Mk2 → Vulcanus, Scout Mk2 → Fulgora, Bulwark Mk2 → Gleba, Voyage Mk2 → Aquilo)
- Removed legacy compatibility code (Krastorio2, AAI Industry, Alien Biomes)
- Modular compatibility system for easier future integration

Original mod: https://mods.factorio.com/mod/spidertrontiers-community-updates

If you find any bugs, please open an issue on GitHub.