Option to record audio output to WAVE and don't use audio output via -w and -an command line flag respectively

[DevanWolf]

Great for silently rendering MIDI files without having to disconnect/mute speakers.

[linoshkmalayil]

jcmoyer's fork: https://github.com/jcmoyer/Nuked-SC55 has a separate executable that does the rendering without playback. Also my fork (based on jcmoyer's work) also does the same: https://github.com/linoshkmalayil/Nuked-SC55-GUI-Float