Added Elytra support, set Options.Elytra.Enabled-Elytra to true to use, there a few options for it
Options.Elytra.Give-Fireworks to give players fireworks when the game starts
Options.Elytra.Fireworks-Slot the firework slot
Options.Elytra.Auto-Renew-Fireworks if enabled, players will keep receiving a new firework every few seconds until they have a stack
Options.Elytra.Auto-Renew-Fireworks-Delay, the delay of the task above
Options.Elytra.Checkpoint-Margin the checkpoint margin when using Elytra
You also have to enable the elytra on the map, you can do that by running /sr setElytra <map> <true/false>
Only maps with elytra set to true will give elytra and firework to the player.
NMS/ActionBar/Titles optimizations.
Very important! When setting up a arena for Elytra, I'd recommend setting the checkpoints with at least 3 blocks of depth so players won't fly too fast past the checkpoint, not counting it.