adding support for --wrapScalar=false in properties encoder

[dcarbone]

I'm currently running into a scenario where it would be useful to wrap the value side of the output from the Properties encoder.

This PR is a first draft at that with some tests, please let me know if you'd like some more!

[mikefarah]

This looks really good - you just need to add test(s) into properties_test.go, this will also generate documentation so others know about the feature 👍🏼

[dcarbone]

@mikefarah i've updated the test workflow a bit and added one for my added feature.

if you disagree with the changes, i can work on a different solution.

(bad internet, sorry for the double comment)

Additionally, I would like to potentially take a stab at refactoring a bit of the test suite, but could do that in a separate PR.

[mikefarah]

Thank you! There is a problem though in the documentation generated, it doesn't show the updated command to get the wrapping (e..g supplying --unwrapScalar=false - if you have a look at xml_test.go, you can see that there are added 'scenarioType's that generate a slightly different documentation on the command, as well us parameterising the encoder/decoder correctly.

[dcarbone]

@mikefarah sorry it took a few days to get back to you on this! i reverted my initial pass as it wasn't really in keeping with your original design, and i didn't want to start imposing my own opinions there.

with this update, i've done the following:

1. replaced the various if .. else .. cases when processing scenarios with a switch
   • this was mostly to make it a smidge cleaner to read and expand upon, and also forces future scenarioTypes to have an explicit handler, rather than letting it succeed with ambiguous correctness.
2. replaced a few var definitions with const as their values are indeed constant
3. added a new scenario type (encode-wrapped) for the properties test suite.

let me know what you think :)