Fix incompatibillity of LWJGL2 with the upcoming Java 16

LWJGL 2 is outdated, I got no idea why Galimulator is still using
But I don't really care about it, do I?

.gitignore

@@ -1,5 +1,6 @@
 # Ignore Gradle build output directory
 build/
+bin/
 
 # Ignore the galimulator jar - which we are not allowed to distribute
 galimulator-desktop.jar

src/main/java/net/minestom/server/extras/selfmodification/HierarchyClassLoader.java

@@ -38,4 +38,10 @@ public void removeChildInHierarchy(MinestomExtensionClassLoader child) {
         children.remove(child);
         children.forEach(c -> c.removeChildInHierarchy(child));
     }
+
+    @Override
+    public String findLibrary(String libname) {
+        // We are increasing the visibility of this method knowingly to suppress an issue with LWJGL running code it shouldn't run.
+        return super.findLibrary(libname);
+    }
 }