Fix Refine Parsing for Various Calls

[bendvc]

By default the refine property for various search type calls (searchProducts, searchContent) gets parsed into a CSV (e.g. color=blue,cgid=root). This behaviour worked fine when the client was originally generate even though it didn't follow the described behaviour as per the Salesforce doc's.

There was an attempt to fix this in the following PR#2 but was abandoned in favour of leaving it and not touching the auto generated code, as it was still working.

It seems as tho Salesforce has discontinued this undocumented behaviour (I can only speculate that this is the cause). So this PR re-introduces that functionality provided by the PR linked above.

Note: A community member proposed a fix here.

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update

Changes

• Add buildRefineParams
• Update opt processing where required
• Update docs
• Update changelog

How to test this PR?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

[bendvc]

Looks like the circle ci status check is broken. Because this is a critical issue for some of our websites, I checked manually that tests are padding on CircleCi and I'm going to merge this pr.