Refactor folder (#10475)

Move many third-party components' source codes from the src folder to a new folder called deps_src. The goal is to make the code structure clearer and easier to navigate.

deps_src/libigl/igl/random_quaternion.h

@@ -0,0 +1,21 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+// 
+// Copyright (C) 2015 Alec Jacobson <alecjacobson@gmail.com>
+// 
+// This Source Code Form is subject to the terms of the Mozilla Public License 
+// v. 2.0. If a copy of the MPL was not distributed with this file, You can 
+// obtain one at http://mozilla.org/MPL/2.0/.
+#ifndef IGL_RANDOM_QUATERNION_H
+#define IGL_RANDOM_QUATERNION_H
+#include "igl_inline.h"
+#include <Eigen/Geometry>
+namespace igl
+{
+  // Return a random quaternion via uniform sampling of the 4-sphere
+  template <typename Scalar>
+  IGL_INLINE Eigen::Quaternion<Scalar> random_quaternion();
+}
+#ifndef IGL_STATIC_LIBRARY
+#include "random_quaternion.cpp"
+#endif
+#endif