Extract LogFile, add (dumb) logging to ERT, AIS apps.

firmware/application/app_ais.hpp

@@ -24,6 +24,7 @@
 
 #include "ui_console.hpp"
 #include "message.hpp"
+#include "log_file.hpp"
 
 #include "ais_baseband.hpp"
 
@@ -32,6 +33,9 @@ public:
 	AISModel();
 
 	baseband::ais::decoded_packet on_packet(const AISPacketMessage& message);
+
+private:
+	LogFile log_file;
 };
 
 namespace ui {