remove '-f' cli option to play files

much easier to listen for midi events, and let aplaymidi, or similar
deal with the complexities of midi files

src/main.cpp

@@ -37,7 +37,6 @@ showUsage(const char* prog_name)
 	printf("    -t: cycle test voltages on DAC\n");
 	printf("    -l: listen for midi events\n");
 	printf("    -k sequencer-port: attempt to connect to port \n");
-	printf("    -f midi-file: play the first track, first channel of a MIDI file\n");
 	printf("    -h: show this help \n");
 	printf("  example:\n");
 	printf("    %s -k 20:0\n", prog_name);
@@ -110,11 +109,8 @@ main(i32 argc, char* argv[])
 	if (!midiOpen(&seq))
 		return 1;
 
-	while ((opt = getopt(argc, argv, "tlk:f:h")) != -1) {
+	while ((opt = getopt(argc, argv, "tlk:h")) != -1) {
 		switch (opt) {
-			case 'f':
-				printf("TODO: parse and play sequence from midi file\n");
-				break;
 			case 'l':
 				loopMIDI(&seq, &spi);
 				break;