Keep Inventory Rebalanced

We all know how annoying losing everthing is. But keep inventory feels like cheating! This data pack aims to fix that by taking inspiration from Terraria's way of doing it: Upon death you lose all of your levels, respawn at half health and with low hunger. This way there is still a price to pay for dying, while still keeping things fun and light-hearted!

This data pack enables keep inventory by default so no need to worry about that!