Unofficial Factorio 2.1 port

This is an unofficial community port/fork of [Ash] https://mods.factorio.com/mod/atan-ash by atanvarno, updated to work with Factorio 2.1 (Space Age compatible).

What changed from the original:

• Updated recipe prototypes to the Factorio 2.1 categories array (the old singular category field was removed by Wube).

• Updated the atan-ash-seperation recipe's product probability field to independent_probability (renamed in 2.1).

• Fixed the "Burned entities drop ash" setting so it actually triggers on fire deaths, no longer crashes, and now correctly awards ash for burned trees.

Credit & license: All original design, art, and code are by atanvarno, licensed under MIT. This fork keeps the original license and copyright notice intact, as required.

A note on this fork's lifetime: This is a stopgap, not a takeover. If atanvarno updates the original Ash mod for Factorio 2.1, please use that version instead this fork will be taken down once that happens. If atanvarno wants this fork removed sooner, message me and I'll take it down immediately, no questions asked.