Give Processors a run() function.

So main() can call it, start a Processor linked in to the baseband binary.

firmware/baseband/proc_wfm_audio.cpp

@@ -23,6 +23,8 @@
 
 #include "audio_output.hpp"
 
+#include "event_m4.hpp"
+
 #include <cstdint>
 
 void WidebandFMAudio::execute(const buffer_c8_t& buffer) {
@@ -122,3 +124,8 @@ void WidebandFMAudio::capture_config(const CaptureConfigMessage& message) {
 		audio_output.set_stream(nullptr);
 	}
 }
+
+void run() {
+	EventDispatcher event_dispatcher { std::make_unique<WidebandFMAudio>() };
+	event_dispatcher.run();
+}