sprintf added, terminal colors

small code fixes and rearangements

clib/printf.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include "../ml.h"
+
+#include <iomanip>
+#include <iostream>
+#include <sstream>
+#include <string>
+#include <vector>
+
+
+std::string mini_sprintf(const std::string &format_str, const std::vector<MlValue> &parameters);