permit additional options in the parameter value

[Steve-Mcl]

Add jsonata & timestamp to parameter value options.

Also, for consideration...

• now Date (for Date types)
• now DateTime (for DateTime types)
• now DateTime2 (for DateTime2 types)

This simplifies things like a datetime to be set to now or getting info from a JS object (using jsonata)

[Steve-Mcl]

Added JSONata, DateTime(now) & UUID and JS/Unix (now) Epochs in V0.6.0