Replaced python calls with json

[vshekar]

Added a mechanism to replace exec and function calls with a structured json that can only execute functions in a whitelist

[vshekar]

Will force push without the code formatting, as there are too many changes to review

[JunAishima]

Overall, looks good. There are also a few other positive aspects:

• A lot of args/kwargs preserve numerical type, if the value isn't coming from a GUI text box
• Get rid of a fair bit of ugly old-style string assembly, before f strings
• generate_server_message() is well-composed to handle command, args, kwargs to allow full flexibility of calls as with the previous method
• no ispybLib commands are on the whitelist, except for the insertRasterResult() so it shouldn't be possible to do the full cycle of adding yourself to a different proposal. you probably could add your collection to another experiment, but that won't be too useful (but would need to reverse-engineer all of the information in the collection request to do so)
• Do you think we could just extract the send_to_server() function so that one function will be called to generate the message, log, then send to the appropriate queue?

[JunAishima]

Just want some more explanation for why the generate_server_message() needed to be brought into the ControlMain class