Import YEEP-144 library 1.2 sources

Source-only snapshot of the 1.2 release. Drivers/ (the vendored ST HAL and
CMSIS) is excluded at 173 MB; fetch it from STMicroelectronics/STM32CubeH5 to
build.

YEEP144lib/include/YEEP144_Buzzer.h

@@ -0,0 +1,10 @@
+#ifndef __YEEP144_BUZZER_H
+#define __YEEP144_BUZZER_H
+
+void YEEP144_Buzzer_Init(void);
+void YEEP144_Buzzer_Tone(uint32_t freq, uint32_t duration);
+void YEEP144_Buzzer_GoTone(uint32_t freq);
+void YEEP144_Buzzer_NoTone(void);
+void YEEP144_Buzzer_Daisy(void);
+
+#endif