Downloaded LWJGL libraries

- LWJGL is no longer shaded into the Bukkit jar
- plugin.yml lists the LWJGL jars and Linux natives as Spigot libraries
- The Paper loader resolves the same plugin.yml list through the Maven Central mirror
- The packed payload no longer reserves the LWJGL natives prefix
- Tests cover reading the library list from the plugin jar

adapters/bukkit/plugin/src/main/resources/plugin.yml

@@ -27,3 +27,4 @@ permissions:
     description: Allows survival players to fell Iris-managed trees with an axe.
     default: op
 api-version: '${apiVersion}'
+libraries: [ ${libraries} ]