Build a Mojang mapped jar in addition to the reobf one, publish both to Modrinth with correct metadata (#2981)

worldedit-core/src/main/java/com/sk89q/worldedit/WorldEditManifest.java

@@ -64,7 +64,7 @@ public class WorldEditManifest {
     }
 
     @Nullable
-    private static Attributes readAttributes() {
+    public static Attributes readAttributes() {
         Class<WorldEditManifest> clazz = WorldEditManifest.class;
         String className = clazz.getSimpleName() + ".class";
         String classPath = clazz.getResource(className).toString();