Kestramon Onboarding

4.5.0 - Removes the external shaderpack download. The previous file (4.4.0) was rejected with "Please remove the external zip downloaded". That feature is now gone entirely: the mod no longer downloads, fetches or unpacks anything from the internet, and the code that did so has been deleted rather than disabled. It now only detects a shaderpack the player has already installed themselves, and falls back to the default pack when none is present. Also added an attribution notice for third-party artwork included under MIT (Cobblemon Economy by Ryvexam).