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/src/internal/NeoBufferContext.h

@@ -0,0 +1,48 @@
+/*-------------------------------------------------------------------------
+NeoPixel library
+
+Written by Michael C. Miller.
+
+I invest time and resources providing this open source code,
+please support me by dontating (see https://github.com/Makuna/NeoPixelBus)
+
+-------------------------------------------------------------------------
+This file is part of the Makuna/NeoPixelBus library.
+
+NeoPixelBus is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as
+published by the Free Software Foundation, either version 3 of
+the License, or (at your option) any later version.
+
+NeoPixelBus is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with NeoPixel.  If not, see
+<http://www.gnu.org/licenses/>.
+-------------------------------------------------------------------------*/
+#pragma once
+
+// This is used to allow a template classes that share common buffer concept to
+// be able to pass that common information to functions 
+// The template classes just need to expose a conversion operator to this type
+template <typename T_COLOR_FEATURE> struct NeoBufferContext
+{
+    NeoBufferContext(uint8_t* pixels, 
+        size_t sizePixels) :
+        Pixels(pixels),
+        SizePixels(sizePixels)
+    {
+    }
+
+    uint16_t PixelCount() const
+    {
+        return SizePixels / T_COLOR_FEATURE::PixelSize;
+    };
+
+    uint8_t* Pixels;
+    const size_t SizePixels;
+    
+};