further pruning of legacy render code, now runs on opengl 3.3 core

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gl/shader.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <string>
+#include <vector>
+#include <functional>
+
+#include "object.h"
+
+namespace gl
+{
+    class shader : public object
+    {
+    public:
+        shader(const std::string &filename);
+        ~shader();
+    };
+
+    class program : public object
+    {
+    public:
+        program();
+        program(std::vector<std::reference_wrapper<const gl::shader>>);
+        ~program();
+
+        void bind();
+
+        void attach(const shader &);
+        void link();
+
+        virtual void init();
+	};
+}