All changes made for 10th part of tutorial

voxel_engine.cpp - changed structure, added character controls, physics
almost all files are modified (including shaders)
+ new source directory - physics

src/physics/PhysicsSolver.h

@@ -0,0 +1,21 @@
+#ifndef PHYSICS_PHYSICSSOLVER_H_
+#define PHYSICS_PHYSICSSOLVER_H_
+
+#include <glm/glm.hpp>
+#include <glm/ext.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+
+using namespace glm;
+
+class Hitbox;
+class Chunks;
+
+class PhysicsSolver {
+	vec3 gravity;
+public:
+	PhysicsSolver(vec3 gravity);
+	void step(Chunks* chunks, Hitbox* hitbox, float delta, unsigned substeps, bool shifting);
+	bool isBlockInside(int x, int y, int z, Hitbox* hitbox);
+};
+
+#endif /* PHYSICS_PHYSICSSOLVER_H_ */