Add JSON output format

[KSchopmeyer]

Add the ability to ouput as json. Note that this might not be as simple as it sounds since this could include json table but also json as an output form for the tree.

[andy-maier]

DISCUSSION:

• Are we serious with this item?
• Should the JSON representation from DSP0211 be used?

[andy-maier]

We deicded that we are serious about it, and to start with looking at DSP0211.

[andy-maier]

We discussed this again and now decided that we would wait for user requests before we engage there. Closed as won't fix.