Migrate ATs to JavaExec and make them quiet

src/main/java/net/fabricmc/loom/util/DependencyDownloader.java

@@ -0,0 +1,24 @@
+package net.fabricmc.loom.util;
+
+import org.gradle.api.Project;
+import org.gradle.api.file.FileCollection;
+
+/**
+ * Simplified dependency downloading.
+ *
+ * @author Juuz
+ */
+public final class DependencyDownloader {
+	/**
+	 * Resolves a dependency as well as its transitive dependencies into a {@link FileCollection}.
+	 *
+	 * @param project            the project needing these files
+	 * @param dependencyNotation the dependency notation
+	 * @return the resolved files
+	 */
+	public static FileCollection download(Project project, String dependencyNotation) {
+		var dependency = project.getDependencies().create(dependencyNotation);
+		var config = project.getConfigurations().detachedConfiguration(dependency);
+		return config.fileCollection(dep -> true);
+	}
+}