ui: implemented gui abstraction and dummy view

- added abstract class tree for gui elements.
- implemented concrete gui classes that wrap the qt specific content.
- implemented first DummyView which plays nice with the ViewManager.

review id = 12

src/lib/utility/Vector.h

@@ -0,0 +1,16 @@
+#ifndef VECTOR_H
+#define VECTOR_H
+
+struct Vec4i
+{
+	Vec4i(int x, int y, int z, int w)
+		: x(x)
+		, y(y)
+		, z(z)
+		, w(w)
+	{}
+
+	int x, y, z, w;
+};
+
+#endif // VECTOR_H

src/lib/utility/math/Color.h

@@ -0,0 +1,33 @@
+#ifndef COLOR_H
+#define COLOR_H
+
+template<class T>
+class Color
+{
+public:
+	Color();
+	Color(T r, T g, T b, T a);
+
+	T r, g, b, a;
+};
+
+template<class T>
+Color<T>::Color()
+	: r(0)
+	, g(0)
+	, b(0)
+	, a(0)
+{}
+
+template<class T>
+Color<T>::Color(T r, T g, T b, T a)
+	: r(r)
+	, g(g)
+	, b(b)
+	, a(a)
+{}
+
+typedef Color<float> Colorf;
+typedef Color<int> Colori;
+
+#endif // COLOR_H

src/lib/utility/math/Vector4.h

@@ -0,0 +1,32 @@
+#ifndef VECTOR_4_H
+#define VECTOR_4_H
+
+template<class T>
+class Vector4
+{
+public:
+	Vector4();
+	Vector4(T x, T y, T z, T w);
+
+	T x, y, z, w;
+};
+
+template<class T>
+Vector4<T>::Vector4()
+	: x(0)
+	, y(0)
+	, z(0)
+	, w(0)
+{}
+
+template<class T>
+Vector4<T>::Vector4(T x, T y, T z, T w)
+	: x(x)
+	, y(y)
+	, z(z)
+	, w(w)
+{}
+
+typedef Vector4<int> Vec4i;
+
+#endif // VECTOR_4_H