feat(meshtastic): extract LoBBS plugin library

LoBBSStackGuard.h

@@ -0,0 +1,6 @@
+#pragma once
+// Include after the other includes in every LoBBS .cpp. Commands run on the nRF52 loop task, whose 4 KB stack
+// is shared with the router and has no overflow trap, so each LoBBS function is capped at compile time.
+#if defined(ARDUINO_ARCH_NRF52) && defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic error "-Wstack-usage=512"
+#endif