Add OpenGL backend project and third phase plan

tests/OpenGL/package/glm/test/ext/ext_quaternion_trigonometric.cpp

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+#include <glm/ext/quaternion_trigonometric.hpp>
+#include <glm/ext/quaternion_float.hpp>
+#include <glm/ext/vector_relational.hpp>
+#include <glm/ext/scalar_relational.hpp>
+
+float const Epsilon = 0.001f;
+
+static int test_angle()
+{
+	int Error = 0;
+
+	{
+		glm::quat const Q = glm::quat(glm::vec3(1, 0, 0), glm::vec3(0, 1, 0));
+		float const A = glm::degrees(glm::angle(Q));
+		Error += glm::equal(A, 90.0f, Epsilon) ? 0 : 1;
+	}
+
+	{
+		glm::quat const Q = glm::quat(glm::vec3(0, 1, 0), glm::vec3(1, 0, 0));
+		float const A = glm::degrees(glm::angle(Q));
+		Error += glm::equal(A, 90.0f, Epsilon) ? 0 : 1;
+	}
+
+	return Error;
+}
+
+int main()
+{
+	int Error = 0;
+
+	Error += test_angle();
+
+	return Error;
+}