Conditionally trim trailing periods of argument and option descriptions

[TheTonttu]

fixes #1729

• I have read the Contribution Guidelines
• I have commented on the issue above and discussed the intended changes
• A maintainer has signed off on the changes and the issue was assigned to me
• All newly added code is adequately covered by tests
• All existing tests are still running without errors
• The documentation was modified to reflect the changes OR no documentation changes are required.

Changes

• HelpProvider.TrimTrailingPeriod property affects trailing period of argument and option descriptions in addition to command descriptions.
• Related test case output includes argument and option description in addition to command description.
  • The test case (Should_Not_Trim_Description_Trailing_Period) expectation text (Description_No_Trailing_Period) is a bit confusing/conflicting but I didn't touch it to keep changes minimal.
• Localized print help and print version descriptions include trailing period.
  • Default help output stays the same but when the trimming is disabled the period is added to the output.

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Please upvote 👍 this pull request if you are interested in it.

[TheTonttu]

@microsoft-github-policy-service agree

[FrankRay78]

Thanks, I'll try to review this one over the weekend.