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/NeoPixelBus_by_Makuna/examples/sevensegment/NeoSegmentBus/NeoSegmentBus.ino

@@ -0,0 +1,36 @@
+// NeoSegmentBus
+// This example will demonstrate using the NeoSegmentBus which provides support for a
+// seven segment LED digit driven by three WS2811; connected in series with other digits
+//
+// See https://shop.idlehandsdev.com/products/addressable-7-segment-display for a hardware example
+//
+// This example will print the string "3.14" and then rotate it through the available digits
+//
+
+#include <NeoPixelSegmentBus.h>
+
+const uint16_t DigitCount = 4; // Max Digits, not segments, not pixels
+const uint8_t BusPin = 2;  // make sure to set this to the correct pin, ignored for Esp8266
+
+#define brightness 128
+
+NeoPixelSegmentBus<SevenSegmentFeature, NeoWs2811Method> strip(DigitCount, BusPin);
+
+void setup()
+{
+    strip.Begin();
+    strip.Show(); // clears all digits by default
+
+    delay(500);
+    strip.SetString(0, "3.14", brightness);
+    strip.Show(); 
+}
+
+void loop()
+{
+    delay(2000);
+
+    strip.RotateRight(1); // reads right to left, so it is reversed
+    strip.Show();
+}
+