Started work on ACARS RX

Added ACARS frequencies file
Moved non-implemented apps menu items down

firmware/application/apps/pocsag_app.cpp

@@ -25,8 +25,6 @@
 #include "baseband_api.hpp"
 #include "portapack_persistent_memory.hpp"
 
-#include "pocsag.hpp"
-
 using namespace portapack;
 using namespace pocsag;