Double Jump Boost

Replaces the increased jump height from jump boost with a double (or triple) jump, based on the effect level. Each level of jump boost allows you to jump one more time in midair. Landing will reset your jump count, and a successful mace hit will recover one jump. As you'd expect, jumping at the end of a fall before hitting the ground will avoid or reduce fall damage depending on timing. This makes jump boost more controllable and desirable in survival mode.  --- This idea came from an episode of [The Spawn Chunks](https://thespawnchunks.com) podcast.