added clear screen to console_output::render

src/console_output.cc

@@ -70,6 +70,8 @@ std::string console_output::get_code(const int attr) {
 }
 
 void console_output::render() {
+        out << "\x1B[2J\x1B[H";
+
         for (std::size_t idx = 0; idx < contents.size(); ++idx) {
                 if (idx % DISPLAY_WIDTH == 0 && idx)
                         out << std::endl;