Import ESP_UniClock (upstream 1189810)

Vendored from https://github.com/gpeter62/ESP_UniClock: the sketch
source, the web UI and the libraries the ESP8266 build needs, unpacked
from the bundled zips. Adds a PlatformIO project for the ESP-12. The
source is unchanged; local changes follow as separate commits.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

firmware/uniclock/lib/ESPAsyncWiFiManager/examples/AutoConnectWithTimeout/AutoConnectWithTimeout.ino

@@ -0,0 +1,51 @@
+#if defined(ESP8266)
+#include <ESP8266WiFi.h>          //https://github.com/esp8266/Arduino
+#else
+#include <WiFi.h>
+#endif
+
+//needed for library
+#include <ESPAsyncWebServer.h>
+#include <ESPAsyncWiFiManager.h>         //https://github.com/tzapu/WiFiManager
+
+AsyncWebServer server(80);
+DNSServer dns;
+
+
+
+void setup() {
+  // put your setup code here, to run once:
+  Serial.begin(115200);
+
+  //WiFiManager
+  //Local intialization. Once its business is done, there is no need to keep it around
+  AsyncWiFiManager wifiManager(&server,&dns);
+  //reset settings - for testing
+  //wifiManager.resetSettings();
+
+  //sets timeout until configuration portal gets turned off
+  //useful to make it all retry or go to sleep
+  //in seconds
+  wifiManager.setTimeout(180);
+
+  //fetches ssid and pass and tries to connect
+  //if it does not connect it starts an access point with the specified name
+  //here  "AutoConnectAP"
+  //and goes into a blocking loop awaiting configuration
+  if(!wifiManager.autoConnect("AutoConnectAP")) {
+    Serial.println("failed to connect and hit timeout");
+    delay(3000);
+    //reset and try again, or maybe put it to deep sleep
+    ESP.reset();
+    delay(5000);
+  }
+
+  //if you get here you have connected to the WiFi
+  Serial.println("connected...yeey :)");
+
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+
+}