Elytra Nerf

Only required serverside/singleplayer

- Elytras run out of durability 2x as fast - Elytras get repaired when you take damage (proportional to the damage you take) - Balances out durability change - Incentivizes using explosive rockets! - Elytras decrease magic damage to .85 when worn - Elytras go slower when not boosting - Incentivizes using higher flight duration rockets - When wearing an elytra you are more end-like (take damage in water/rain)