portfolio inside zipperposition

[c-cube]

(longer term)

• make 'a flex_state.key json serializable
• have a set of configurations as json files, embedded into the binary by build system magic
• have a portfolio phase (loops through its internal phases) with hardcoded flow between these configurations ("on timeout"/"on gaveup" on the flow's edges)
• have the portfolio layout being configurable via json, and add --mode <name|file.json> to specifiy a list of left-to-right updates (last one overrides whichever fields it sets).