update check for Unicode support

[norweeg]

Description of new feature, or changes

removes unnecessary system check for Unicode output
changes Unicode support check to instead use the encoder supported by sys.stdout to try to encode a Unicode character. If it succeeds, Unicode is supported, otherwise it is not

resolves #5
resolves #25
resolves #141
obsoletes #142

see #5 (comment)

Checklist

• Your branch is up-to-date with the base branch
• You've included at least one test if this is a new feature
• All tests are passing

Related Issues and Discussions

People to notify

[coveralls]

Pull Request Test Coverage Report for Build 432

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at ?%

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Totals
Change from base Build 429:	0%
Covered Lines:
Relevant Lines:	0

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💛 - Coveralls

[norweeg]

@manrajgrover can you take a look at this?? AppVeyor is failing not on my code change, but at the environment setup for Python 3.7. It can't install pywinpyt which must be a dependency of something required for testing because a Go compiler is not installed on the test server. I believe once that problem is resolved, all tests will pass