CLI race condition: Simultaneous writes to cblue_configuration.json

[AustinZAnderson]

When running multiple cBlue CLI processes in parallel, we discovered what looks to be a race condition. The cblue_configuration.json is a single file in the cBlue app folder, and every parallel process will attempt to update its contents. When two or more processes try to update this file at the same time, we get a JSONDecodeError on line 224 of CBlueApp.py.

I addressed this for our production team by adding an argument to the CLI called --save_config. I turned this option off by default for the CLI, and on by default for the GUI. I would be happy to submit my code for review as a PR or by other means. It looks like I don't currently have the needed permissions to submit a PR.