Add facial gestures as switch options

[willwade]

This would be nice to try out.

https://github.com/open-aac/cordova_face#supported-features

We don't want to use face tracking - but gestures to use as switch options

Something like this:

Where the user then selects one of:

"wink" "smirk" "smile" "mouth_opeen" "kiss" "tongue" "puff" (puff out cheeks) "eyebrows"

[gavinhenderson]

Closing as we can fix this by adding an android build (#84 ) which has facial gestures built in