update release notes for 2.1.0, add subVI to palette

[nate-moehring]

Updated release notes and palette for PRs 39 and 41, improved error reporting.

[nate-moehring]

Tested install of newly built package.

[nate-moehring]

Built package
jki_lib_json_serialization-2.1.0.40.vip.zip

[nate-moehring]

To be clear, I think the ball is in your park to review the built package when you get a chance.

[jimkring]

Thanks, Nate! I’ll give it a try this weekend

[jimkring]

@nate-moehring looking great! I am making a few other minor tweaks and I'll just add them to this PR, if that's OK...

[jimkring]

1. I moved the utility VIs into subpalette
   

2. Made both error inputs of "Add Source Path if Error" required.
   

3. Made some edits to the VI Description (see above) -- started by explaining when to use this VI and why.

4. renamed error in (no error) to simple error in (see above), since less is more (and it's a recommendation of dnatt I believe).

[jimkring]

5. marked Get UTC Offset.vi as source only (seems we missed that one)

[jimkring]

6. renamed error in (no error) to no error for public VIs (only a few were affected)

[jimkring]

7. Added a new example VI that HTTP GET's some JSON and shows how to use the new error handling util.