Iris 1.2.1 for Minecraft 1.16.5

Iris 1.2.1 is ready for download, with plenty of fixes for common issues as well as a few major changes!

Here's what's changed since 1.2:

💻 Switched to the Brachyura™️ build system, allowing developers to build the project and develop faster
🗒️ Added a directive to allow shader developers to cap the entity shadow distance
🕷️ Reworked the code for the red/white entity flash to be more consistent with Vanilla
🎡 Fixed multiple rendering issues with other mods (support is still in progress)
🏔️ Fixed issues with SEUS PTGI entity shadows on 1.17+
🗣️ Multiple translations have been updated
🩹 ...as well as many other fixes!

Known potential issues:

❌ SEUS PTGI HRR Test 3 currently has major graphical issues (SEUS PTGI HRR 2.1 is compatible).

⬇️ Download the release here: https://irisshaders.net/download.html

A more detailed changelog is available for those interested: https://github.com/IrisShaders/Iris/blob/trunk/docs/changelogs/1.2.1/full.md