Updating the license again to open it up a bit

Updating the license to match the general purpose Moonflower license. This should re-open up the codebase itself to something far more open-source friendly, while keeping the animation assets themselves under ARR. Keeping those under ARR is to prevent people from cloning the source locally, removing mentions of my or Moonflower's name from the source, and uploading it to Github/Curseforge/Modrinth/etc *without permission*. I don't believe those need to be under any open source license similar to texture or model assets, but if there are circumstances where you would like permission to use them, please contact me at Trainguy#9512 on discord!