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/Time/library.properties

@@ -0,0 +1,11 @@
+name=Time
+version=1.6.1
+author=Michael Margolis
+maintainer=Paul Stoffregen
+sentence=Timekeeping functionality for Arduino
+paragraph=Date and Time functions, with provisions to synchronize to external time sources like GPS and NTP (Internet).  This library is often used together with TimeAlarms and DS1307RTC.
+category=Timing
+url=http://playground.arduino.cc/Code/Time/
+includes=TimeLib.h
+architectures=*
+