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/ArduinoJson/extras/tests/MsgPackDeserializer/misc.cpp

@@ -0,0 +1,24 @@
+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2022, Benoit BLANCHON
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("deserializeMsgPack() returns EmptyInput") {
+  StaticJsonDocument<100> doc;
+
+  SECTION("from sized buffer") {
+    DeserializationError err = deserializeMsgPack(doc, "", 0);
+
+    REQUIRE(err == DeserializationError::EmptyInput);
+  }
+
+  SECTION("from stream") {
+    std::istringstream input("");
+
+    DeserializationError err = deserializeMsgPack(doc, input);
+
+    REQUIRE(err == DeserializationError::EmptyInput);
+  }
+}