Rengenerate and download all files with --refresh-dependencies (#227)

* Re generate all files with --refresh-dependencies

* Always re-process jar processors

* Update mixin compile extensions

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

@@ -36,6 +36,8 @@ import org.gradle.api.Project;
 import org.gradle.api.logging.Logger;
 
 public class DownloadUtil {
+	public static boolean refreshDeps = false;
+
 	/**
 	 * Download from the given {@link URL} to the given {@link File} so long as there are differences between them.
 	 *
@@ -60,6 +62,11 @@ public class DownloadUtil {
 	public static void downloadIfChanged(URL from, File to, Logger logger, boolean quiet) throws IOException {
 		HttpURLConnection connection = (HttpURLConnection) from.openConnection();
 
+		if (refreshDeps) {
+			getETagFile(to).delete();
+			to.delete();
+		}
+
 		//If the output already exists we'll use it's last modified time
 		if (to.exists()) {
 			connection.setIfModifiedSince(to.lastModified());