(svn r2112) -Fix: ExtMidi no longer halts the game while starting a song

-Fix: Redirect stdin/stdout/stderr of the ExtMidi process to /dev/null, to prevent it from writing to the terminal
While here give the ExtMidi functions canonical names

ttd.c

@@ -641,7 +641,6 @@ int ttd_main(int argc, char* argv[])
 	LoadDriver(SOUND_DRIVER, _ini_sounddriver);
 	LoadDriver(MUSIC_DRIVER, _ini_musicdriver);
 	LoadDriver(VIDEO_DRIVER, _ini_videodriver); // load video last, to prevent an empty window while sound and music loads
-	MusicLoop();
 	_savegame_sort_order = 1; // default sorting of savegames is by date, newest first
 
 #ifdef ENABLE_NETWORK
@@ -1165,8 +1164,7 @@ void GameLoop(void)
 
 	InputLoop();
 
-	if (_game_mode != GM_MENU)
-		MusicLoop();
+	MusicLoop();
 }
 
 void BeforeSaveGame(void)