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/ModelessConnect/ModelessConnect.ino

@@ -0,0 +1,46 @@
+#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;
+AsyncWiFiManager wifiManager(&server,&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
+    //reset saved settings
+    //wifiManager.resetSettings();
+
+    //set custom ip for portal
+    //wifiManager.setAPConfig(IPAddress(10,0,1,1), IPAddress(10,0,1,1), IPAddress(255,255,255,0));
+
+    //fetches ssid and pass from eeprom 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
+    //wifiManager.autoConnect("AutoConnectAP");
+    //or use this for auto generated name ESP + ChipID
+    //wifiManager.autoConnect();
+    wifiManager.startConfigPortalModeless("ModelessAP", "Password");
+
+
+ server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
+    request->send(200, "text/plain", "Hello World");
+  });
+
+}
+
+void loop() {
+    // put your main code here, to run repeatedly:
+    wifiManager.loop();
+}