Bukkit

Updated to 1.16.4 server

Fixed following bugs:

- Map colors added in 1.16 don't render or cause client crash

- Invalid offset of some entities (boats, minecarts on <= 1.8)

- Fix bed item mapping for < 1.12

- Fix chunk data encoding (global palette using wrong bits per block size, second light update before sending chunk data sends invalid biomes). - Fix missing lava damage sound

- Fix thrown potion texture for <= 1.8 clients

Implemented multiple entity passengers for < 1.9 (For clients that don't support multiple passengers, they are stacked on top of each other (depth first, ascending)). This actually makes it possible to use multiple entity passengers on server, while before it was blocked to prevent issues.