Restructure serialnumber, remove console, add RTC

Move and rename serial number API into lib-gd32 (hal_serialnumber.h/cpp -> serialnumber.h/cpp), remove the hal:: namespace and make kSnSize a constexpr. Update callers (rdm_device_base) to include the new header and call SerialNumber().

Remove the console subsystem implementation and headers (console/i2c, console/null, console/uart0 and console include files) from lib-hal.

Add a new GD32 RTC driver implementation (lib-hal/rtc/gd32/hwclockrtc.cpp) with RTC configuration, get/set/alarm functions and platform-specific handling for GD32F4/H7.

Apply style/formatting and small API cleanups in pixel headers (pixel.h, pixeltype.h) and minor include cleanup in lib-hal/include/gd32/hal.h. Update copyright years where applicable.

Author: vanvught

lib-hal/include/hal_serialnumber.h lib-gd32/include/serialnumber.hlib-hal/include/hal_serialnumber.h renamed to lib-gd32/include/serialnumber.h

@@ -1,8 +1,8 @@
 /**
- * @file hal_serialnumber.h
+ * @file serialnumber.h
  *
  */
-/* Copyright (C) 2025 by Arjan van Vught mailto:info@gd32-dmx.org
+/* Copyright (C) 2026 by Arjan van Vught mailto:info@gd32-dmx.org
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -22,16 +22,12 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-
-#ifndef HAL_SERIALNUMBER_H_
-#define HAL_SERIALNUMBER_H_
+#ifndef SERIALNUMBER_H_
+#define SERIALNUMBER_H_
 
 #include <cstdint>
 
-namespace hal
-{
-inline static constexpr uint32_t kSnSize = 4;
+inline constexpr uint32_t kSnSize = 4;
 void SerialNumber(uint8_t sn[kSnSize]);
-} // namespace hal
 
-#endif  // HAL_SERIALNUMBER_H_
+#endif // SERIALNUMBER_H_

lib-hal/src/gd32/hal_serialnumber.cpp lib-gd32/src/serialnumber.cpplib-hal/src/gd32/hal_serialnumber.cpp renamed to lib-gd32/src/serialnumber.cpp

@@ -1,8 +1,8 @@
 /**
- * @file hal_serialnumber.cpp
+ * @file serialnumber.cpp
  *
  */
-/* Copyright (C) 2025 by Arjan van Vught mailto:info@gd32-dmx.org
+/* Copyright (C) 2025-2026 by Arjan van Vught mailto:info@gd32-dmx.org
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -25,9 +25,8 @@
 
 #include <cstdint>
 
-#include "hal_serialnumber.h"
+#include "serialnumber.h"
 
-namespace hal {
 void SerialNumber(uint8_t sn[kSnSize]) {
 #if defined(GD32H7XX)
     const auto kMacaddressHigh = *reinterpret_cast<volatile uint32_t*>(0x1FF0F7E8);
@@ -42,4 +41,3 @@ void SerialNumber(uint8_t sn[kSnSize]) {
     sn[2] = static_cast<uint8_t>((kMacaddressHigh >> 16) & 0xFF);
     sn[3] = static_cast<uint8_t>((kMacaddressHigh >> 24) & 0xFF);
 }
-} // namespace hal