Update GLM to latest version (0.9.9.3). This includes GLM's change of matrices no longer default initializing to the identity matrix. This commit thus also includes the update of all of LearnOpenGL's code to reflect this: all matrices are now constructor-initialized to the identity matrix where relevant.

includes/glm/ext/quaternion_trigonometric.hpp

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+/// @ref ext_quaternion_trigonometric
+/// @file glm/ext/quaternion_trigonometric.hpp
+///
+/// @defgroup ext_quaternion_trigonometric GLM_EXT_quaternion_trigonometric
+/// @ingroup ext
+///
+/// Provides trigonometric functions for quaternion types
+///
+/// Include <glm/ext/quaternion_trigonometric.hpp> to use the features of this extension.
+///
+/// @see ext_quaternion_float
+/// @see ext_quaternion_double
+/// @see ext_quaternion_exponential
+/// @see ext_quaternion_geometric
+/// @see ext_quaternion_relational
+/// @see ext_quaternion_transform
+
+#pragma once
+
+// Dependency:
+#include "../trigonometric.hpp"
+#include "../exponential.hpp"
+#include "scalar_constants.hpp"
+#include "vector_relational.hpp"
+#include <limits>
+
+#if GLM_MESSAGES == GLM_ENABLE && !defined(GLM_EXT_INCLUDED)
+#	pragma message("GLM: GLM_EXT_quaternion_trigonometric extension included")
+#endif
+
+namespace glm
+{
+	/// @addtogroup ext_quaternion_trigonometric
+	/// @{
+
+	/// Returns the quaternion rotation angle.
+	///
+	/// @tparam T A floating-point scalar type
+	/// @tparam Q A value from qualifier enum
+	template<typename T, qualifier Q>
+	GLM_FUNC_DECL T angle(qua<T, Q> const& x);
+
+	/// Returns the q rotation axis.
+	///
+	/// @tparam T A floating-point scalar type
+	/// @tparam Q A value from qualifier enum
+	template<typename T, qualifier Q>
+	GLM_FUNC_DECL vec<3, T, Q> axis(qua<T, Q> const& x);
+
+	/// Build a quaternion from an angle and a normalized axis.
+	///
+	/// @param angle Angle expressed in radians.
+	/// @param axis Axis of the quaternion, must be normalized.
+	///
+	/// @tparam T A floating-point scalar type
+	/// @tparam Q A value from qualifier enum
+	template<typename T, qualifier Q>
+	GLM_FUNC_DECL qua<T, Q> angleAxis(T const& angle, vec<3, T, Q> const& axis);
+
+	/// @}
+} //namespace glm
+
+#include "quaternion_trigonometric.inl"