integrated zlib and libpng; initial driver work

hecl/driver/CToolBase.hpp

@@ -0,0 +1,14 @@
+#ifndef MAIN_CPP
+#error This file may only be included from main.cpp
+#endif
+
+class CToolBase
+{
+protected:
+    const std::vector<std::string>& m_args;
+public:
+    CToolBase(const std::vector<std::string>& args)
+    : m_args(args) {}
+    virtual ~CToolBase() {}
+};
+