Implement new api: CyComands and CyREST functions

[IgorRodchenkov]

Implement new api: CyComands and CyREST functions.
Ask Christian and David for help; see also, e.g., stringApp (Scooter's).

[IgorRodchenkov]

But first, we are to define some data analysis pipelines, protocols; otherwise, implementing Cy commands in CyPath2 app does not make much of a difference or sense...