Moved C++ code into new libslic3r directory

xs/src/libslic3r/PlaceholderParser.hpp

@@ -0,0 +1,32 @@
+#ifndef slic3r_PlaceholderParser_hpp_
+#define slic3r_PlaceholderParser_hpp_
+
+
+#include <myinit.h>
+#include <map>
+#include <string>
+#include "PrintConfig.hpp"
+
+
+namespace Slic3r {
+
+class PlaceholderParser
+{
+    public:
+    std::map<std::string, std::string> _single;
+    std::map<std::string, std::string> _multiple;
+
+    PlaceholderParser();
+    ~PlaceholderParser();
+
+    void apply_config(DynamicPrintConfig &config);
+
+    private:
+    template<class T>
+    void set_multiple_from_vector(
+        const std::string &key, ConfigOptionVector<T> &opt);
+};
+
+}
+
+#endif