migrate ALMOST everything from source tree into client

source/client/common/Matrix.hpp

@@ -0,0 +1,31 @@
+/********************************************************************
+	Minecraft: Pocket Edition - Decompilation Project
+	Copyright (C) 2023 iProgramInCpp
+	
+	The following code is licensed under the BSD 1 clause license.
+	SPDX-License-Identifier: BSD-1-Clause
+ ********************************************************************/
+
+#pragma once
+
+#include <cstring>
+#include "Mth.hpp"
+#include "compat/GL.hpp"
+
+class Matrix
+{
+public:
+	Matrix();         // create an empty matrix
+	Matrix(float a);  // create an identity matrix
+	Matrix(float* p); // load matrix from memory
+	Matrix(float a, float b, float c, float d, float e, float f, float g, float h, float i, float j, float k, float l, float m, float n, float o, float p);
+	void fetchGL(GLenum pname);
+
+	friend Matrix operator*(const Matrix& a, const Matrix& b);
+
+public:
+	float c[16] = { 0.0f };
+};
+
+Matrix operator*(const Matrix& a, const Matrix& b);
+