Add API for "AsValue()" type functions

[Blake-Madden]

Deprecate older function names
Improve documentation
Adds unit tests
Fix a few minor issues discovered from unit tests
Make Add() overload that can be unsafe private
Closes #9
Closes #2
Fixes part of #10

[mtangoo]

Can you add operator overloading [] as the linked ticket says? Also I will wait for tests that should cover this (and may be the other [] part?) before merging

[mtangoo]

We need to have an overloaded []

[Blake-Madden]

Got it. I'll add [] this weekend. Might need a few days for the tests, I'll try to have those done mid-next week.

[mtangoo]

Take your time.
Thanks for good work on the library

[Blake-Madden]

I have implemented everything except for operator[].

So, I tried doing this, but the API winds up being really awkward because we use wxSharedPtr for nodes. Because of that, you would need to deference that to use []. As an example:

(*json)["the-property"]->AsString()

IMO, that looks more confusing than json->GetProperty("the-property")->AsString().

What do you think?

[mtangoo]

Hi @Blake-Madden thanks for great working you are doing. Let me know when you are done for full review and merging

[Blake-Madden]

This is ready now. I've added every unit test that I can think of and the AsXXX() API works great.

The operator[] functionality just doesn't make sense for this library since it uses smart pointers, so I'm leaving that out.

[mtangoo]

Thanks for your time and effort. I'll definitely review and merge