* display CommandParsing gracefully
This set of changes handles CommandParsingException gracefuly (so as not to show the user a stack trace) and generalizes graceful exception display somewhat away from being type-specific.
* fix compile error by inlining constant
* remove unused test logging
* remove some try catches choking all exceptions
* rename ExceptionExtension to ReportAsWarning, show full stack instead of just message
* dotnet-migrate try catch clean-up
* fix migration test failures