XTCE13 — Yamcs supports json syntax for array and aggregate parameter/args initial value

Maybe we should align with yamcs

initial value

Initial (default) value given to a parameter or command argument.

Note that this value can be overwritten for specific parameters, or command arguments using a column of the same name in the Commands and Parameters sheets.

The value must be understandable for the used engineering type.

For binary, use a hexadecimal notation.

For booleans, use a value of true or false.

For arrays, specify a value in JSON format: [-3, -2.4, 5].

For aggregates, specify a value in JSON format:

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