Move JarJar Metadata to the parent Jar task

The parent jar task will now *always* include `META-INF/jarjar/metadata.json`, and the jarJar child task will be responsible for including the embedded dependencies. This will be important for enforcing required dependencies in the JarJar selector, whether or not they are constraints.

Author: Jonathing

jarjar-gradle/src/main/java/net/minecraftforge/jarjar/gradle/JarJar.java

@@ -4,6 +4,7 @@
  */
 package net.minecraftforge.jarjar.gradle;
 
+import net.minecraftforge.gradleutils.shared.Closures;
 import org.gradle.api.Action;
 import org.gradle.api.Project;
 import org.gradle.api.Task;
@@ -63,9 +64,15 @@ static TaskProvider<JarJar> register(JarJarContainerInternal container, Action<?
             if (jarJarTask.configurationBuildDependencies != null)
                 jarJarTask.dependsOn(jarJarTask.configurationBuildDependencies);
 
-            jarJarTask.dependsOn(metadata);
-            jarJarTask.getMetadataFile().set(metadata.flatMap(JarJarMetadata::getMetadataFile));
-            jarJarTask.setManifest(jar.get().getManifest());
+            jar.get().configure(Closures.<Jar>consumer(jarTask -> {
+                jarTask.dependsOn(metadata);
+
+                jarTask.from(metadata.flatMap(JarJarMetadata::getMetadataFile), copy -> copy
+                    .into("META-INF/jarjar")
+                );
+
+                jarJarTask.setManifest(jarTask.getManifest());
+            }));
         });
 
         return jarJar;
@@ -89,8 +96,6 @@ public void setConfiguration(Provider<? extends Configuration> configuration) {
         this.setConfiguration(configuration.get());
     }
 
-    public abstract @InputFile RegularFileProperty getMetadataFile();
-
     private final JarJarProblems problems = this.getObjectFactory().newInstance(JarJarProblems.class);
 
     protected abstract @Inject ProviderFactory getProviders();
@@ -100,7 +105,6 @@ public JarJar() { }
     @Override
     protected void copy() {
         this.jarJarCopySpec.from(this.getIncludedClasspath());
-        this.jarJarCopySpec.from(this.getMetadataFile());
         super.copy();
     }
 }