Time series product file - enable YAxis list

[smalers]

Subject of the issue

Recent work in separate software is using the JSON time series product specification used in TSTool. TSTool's graph and time series product currently only handle left and right y-axis. However, other software supports multiple Y axes. A version of the JSON time series product file has been developed in other software but is not yet supported in TSTool. At a minimum, the time series product file needs to have the option to include the YAxes array. If time is available, the graphing features and time series product editor should be updated to allow multiple Y axes.

Environment

• TSTool 14.9.1