add stm32wl5e platform and wio-e5 variant (#1631)

Co-authored-by: Peter Lawrence <12226419+majbthrd@users.noreply.github.com>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/platform/stm32wl/main-stm32wl.cpp

@@ -0,0 +1,27 @@
+#include <stm32wle5xx.h>
+#include <stm32wlxx_hal.h>
+#include "configuration.h"
+#include "RTC.h"
+
+void setBluetoothEnable(bool on) {}
+
+void playStartMelody() {}
+
+void updateBatteryLevel(uint8_t level) {}
+
+void getMacAddr(uint8_t *dmac)
+{
+    for (int i = 0; i < 6; i++)
+        dmac[i] = i;
+}
+
+void cpuDeepSleep(uint64_t msecToWake) {}
+
+/* pacify libc_nano */
+extern "C" {
+int _gettimeofday( struct timeval *tv, void *tzvp )
+{
+    return -1;
+}
+}
+