- added a few more FileRdr replacements

- fixed: The streaming music player must return the file reader if it fails to open, so that the next player can still use it.
- fixed: Timidity++'s Instruments class did not delete the sound font when it was destroyed.

..-

src/sound/timiditypp/instrum.cpp

@@ -75,6 +75,8 @@ Instruments::~Instruments()
 
 	free_tone_bank();
 	free_instrument_map();
+
+	if (sfreader != nullptr) delete sfreader;
 }
 
 void Instruments::free_instrument(Instrument *ip)