Improvements on Datapack and Ressource packs

The first one is the direct installation, we double-clicking on either a datapack or a resource pack automatically installs it directly into the game.

The second one is global datapacks, just like resource packs, allow global datapacks that can be assigned to a world without having to re-add them every time.

The last one is linking packs you can add a file that merges both or links them together