option to use detected song length

[sketchbook22]

By default you use 90 seconds as the duration, which in many cases might be good. However if I have a whole folder of songs that I would like to use the entire song, it would be nice if I could tell it to use the detected song length.

I have an idea of what the code change would be.

example command java -jar AutoStepper.jar input="./songs/" duration=-1

src/autostepper/AutoStepper.java line 285

float songTime = stream.getMillisecondLength() / 1000f;
if( duration == -1f ) duration = songTime;

side note: your readme file says "common line with arguments" I'm nearly certain it should say "command line with arguments"

[mrlazygreen]

Did anyone try this?