Flight Beacons

Changes

• Added advancement to The End section of vanilla advancements to introduce flight beacon crafting method.
• Changed beacon drop functionality to require crouch hitting the beacon entity to kill it.
• Changed flight beacon placement item to Eye of Ender, in order to detect its use via advancement, which is less laggy than trying to catch firework use every tick like in previous versions.
• Added advancement to catch old beacon placement items and replace them with new beacon placement items, so users of previous version won't lose their flight beacon placement items upon updating.
• Added lore to beacon placement item to describe how to use it.
• Changed flight management functions to schedule their execution after a beacon is active, and then continue to schedule their execution every tick so long as there is a loaded active beacon. This means you'll need to deactivate and reactive  active beacons that become unloaded, but it's more lag friendly this way.
• Set DeathLootTable of Flight Beacon shulkers to minecraft:empty to prevent shulker shell drops happening in the unlikely event a Flight Beacon shulker is outright killed.