Method width

tutorials/external/catch.hpp:6729–6733

	explicit Column(std::string const& text) { m_strings.push_back(text); }

	auto width(size_t newWidth) -> Column& {
		assert(newWidth > 0);
		m_width = newWidth;
		return *this;
	}
	auto indent(size_t newIndent) -> Column& {
		m_indent = newIndent;
		return *this;