Add support for BtnMomentary

[lucasdemarchi]

A button that is active while pressed and inactive when released

[wungfuh]

hello @lucasdemarchi , I am new to open source and will like to contribute to this project. I have intermediate level in C programming and Mechatronic skills. I would like some guidance and direction on where to start.

[AndKe]

@wungfuh welcome - do you have a Parrot disco too?

[wungfuh]

@AndKe unfortunately I don't. Presently I don't have any hardware except basic electronic components, an arduino uno and a raspberry pi.