Add web front-end and fix API issues

node_modules/concurrently/dist/lib/flow-control/log-output.js

@@ -0,0 +1,16 @@
+/**
+ * Logs the stdout and stderr output of commands.
+ */
+export class LogOutput {
+    logger;
+    constructor({ logger }) {
+        this.logger = logger;
+    }
+    handle(commands) {
+        commands.forEach((command) => {
+            command.stdout.subscribe((text) => this.logger.logCommandText(text.toString(), command));
+            command.stderr.subscribe((text) => this.logger.logCommandText(text.toString(), command));
+        });
+        return { commands };
+    }
+}