New hardcore gamemode 1.0

- Installing the datapack:
- Download the "New Hardcore Gamemode" datapack and place it in the "datapacks" folder of your Minecraft world.
- Restart the world or run the "/reload" command to activate the datapack.
- A structure will appear in your world's spawn.

- Life system :
- You can get a life by crafting a special item. See the craft shown, or use the `/trigger HardcoreShowCraft` command in-game.
- You have a limited number of lives, up to three. Three times you can be brought back to life.
- Players can see how many lives they have left in the player list (the tab).
- When a player has no lives left and no "extra life", he is carried to the gates of hell. His only chance of reappearing is to be resurrected.

- Extra life :
- A 4th life can be looted from the chests of vanilla structures. This 4th life is called "extralife".
- This "extralife" cannot be crafted.

- Resurrection ritual:
- When a player dies, his soul, which has left for the underworld, must be recalled to a special structure located in the world spawn.
- To resurrect a player, another living player must go to the resurrection structure and activate the ritual by interacting with it.
- The tools required for resurrection are a book of power, a book of knowledge, a book of sorcery, a joker and a piece of paper bearing the name of the player.