feat(cli): Added support for user-defined in 'styles' passed into the 'CLI' constructor as well as the 'exec()' method.
feat(template): Added 'subheading' style.
fix(template): Properly escape tildes in templates with nested expressions.
fix(help): Fixed option heading and subheading styling where the trailing  wasn't styled and whitespace was being trimmed.
fix(help): Fixed option format to use proper required indicators.
fix(cli): Fixed rendering of errors to debug log when server connection executes a command that throws an exception.