Implement a request counter to keep track of free usage

[E3V3A]

I suggest we implement a request counter to keep track of the number of GA requests that has been made, so that the users do not exceed their free quota of ~240 requests/month.

When the GA request is understood and processes, it returns a done:true, that we could use.

[ASSTNT] GA Transcription:  { transcription: 'Make me a sandwich',  done: true }

This value need to be:

• saved upon module shutdown to the file ./assets/googleRC.dat.
• saved within module for conversation restarts, and remote MM connections.
  gRQC = this.googleRequestCounter
• shown updated under microphone icon after each successful completion when config option:
  showGRC: true.