define dictionaries for json tags

[gidden]

There are currently a number of places where the json implementation key for a variety of parameters is hardcoded. For example, I've used something along the lines of dictionary["powerLevel"]. If this were to change in the future, I'd have to change it at every location. Instead, I suggest defining in a separate location a map of variables to parameter names, e.g. power_tag = "powerLevel". This has been done already in some places but not everywhere.