move radiolib wrappers to dedicated directory

src/helpers/radiolib/CustomSTM32WLx.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <RadioLib.h>
+
+#define SX126X_IRQ_HEADER_VALID                     0b0000010000  //  4     4     valid LoRa header received
+#define SX126X_IRQ_PREAMBLE_DETECTED           0x04
+
+class CustomSTM32WLx : public STM32WLx {
+  public:
+    CustomSTM32WLx(STM32WLx_Module *mod) : STM32WLx(mod) { }
+
+    bool isReceiving() {
+      uint16_t irq = getIrqFlags();
+      bool detected = (irq & SX126X_IRQ_HEADER_VALID) || (irq & SX126X_IRQ_PREAMBLE_DETECTED);
+      return detected;
+    }
+};