make use of C++ = default constructor declarations as well as more non-static member initialization syntax.

libdevcore/IndentedWriter.h

@@ -34,8 +34,6 @@ DEV_SIMPLE_EXCEPTION(IndentedWriterError);
 class IndentedWriter
 {
 public:
-	explicit IndentedWriter(): m_lines(std::vector<Line>{{std::string(), 0}}) {}
-
 	// Returns the formatted output.
 	std::string format() const;
 
@@ -61,7 +59,7 @@ private:
 		unsigned indentation;
 	};
 
-	std::vector<Line> m_lines;
+	std::vector<Line> m_lines{{std::string(), 0}};
 };
 
 }