WARNING: REMOVED: DrawCubeTexture(), DrawCubeTextureRec()

Those two functions have been moved to a new example: `models_draw_cube_texture`. The reasons for this decision:
 - Function inflexibility: Many users with the need to draw a textured cube could need to customize the texture applied to every face, that function did not allow that kind of functionality.
 - rlgl functionality exposure: The implementation exposed will teach users how to implement custom textured triangles drawing.

src/raylib.h

@@ -1412,8 +1412,6 @@ RLAPI void DrawCube(Vector3 position, float width, float height, float length, C
 RLAPI void DrawCubeV(Vector3 position, Vector3 size, Color color);                                       // Draw cube (Vector version)
 RLAPI void DrawCubeWires(Vector3 position, float width, float height, float length, Color color);        // Draw cube wires
 RLAPI void DrawCubeWiresV(Vector3 position, Vector3 size, Color color);                                  // Draw cube wires (Vector version)
-RLAPI void DrawCubeTexture(Texture2D texture, Vector3 position, float width, float height, float length, Color color); // Draw cube textured
-RLAPI void DrawCubeTextureRec(Texture2D texture, Rectangle source, Vector3 position, float width, float height, float length, Color color); // Draw cube with a region of a texture
 RLAPI void DrawSphere(Vector3 centerPos, float radius, Color color);                                     // Draw sphere
 RLAPI void DrawSphereEx(Vector3 centerPos, float radius, int rings, int slices, Color color);            // Draw sphere with extended parameters
 RLAPI void DrawSphereWires(Vector3 centerPos, float radius, int rings, int slices, Color color);         // Draw sphere wires