Firmware, GPAD_API, Extension, "i" and "j" Commands for Information / Full Status

[ForrestErickson]

Is your feature request related to a problem? Please describe.
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A controller will need to know information about the peripheral.

The manufacturer name
The model number
The firmware name and version number
Firmware compile date and time
The serial number (MAC)
The IPAddress if there is one.
User settings (volume level for example)

Describe the solution you'd like
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Send an "i" to the device
The device returns a human readable list of the information.

Send an "j" to the device
The device returns a JSON file of the information.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Consider using the SCPI information request command "*IDN?" for system identifying fields,
See setion 4.1.3.6 *IDN? in document: https://www.ivifoundation.org/downloads/SCPI/scpi-99.pdf

A fuller table 4.1.1 IEEE Mandated Commands is on page 15.

Additional context
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