Disableable microphone

[frankruegamer]

The script currently records your microphone as well.
It would be nice to have a variable to disable/enable it as parameter as described in #4.

[D3SOX]

I added it to my fork. I would like to point out here that it would be nice to have those modes I implemented boilerplate code for (none,system,mic,both). I have currently only implemented none and microphone mode