Testing external clock detection and auto-switch

Simplified audio spectrum computation and transfer
ACARS RX in debug mode
Disabled ABI warnings
Updated binary

firmware/application/clock_manager.hpp

@@ -42,7 +42,7 @@ public:
 	{
 	}
 
-	void init();
+	void init(const bool use_clkin);
 	void shutdown();
 
 	void run_from_irc();