Add speech control to AsTeRICS Ergo

[klues]

It would be nice if AsTeRICS Ergo could be controlled by speech commands.

[klues]

Added experimental speech control with annyang, see https://github.com/TalAter/annyang
see 3c89172 on branch https://github.com/asterics/AsTeRICS-Ergo/tree/bklaus/issue%23134/add-speech-control