HPP-FCL 1.8.0

What's Changed

• [CMake] Qhull is a private dependency by @nim65s in #247
• Remove useless warnings by @jcarpent in #248
• fix submodule url by @nim65s in #246
• Remove warnings and add missing noalias by @jcarpent in #249
• Function makeOctree returns a shared pointer by @florent-lamiraux in #254
• Add support of HeightField by @jcarpent in #251
• [OcTree] Add method to save octree in obj file. by @florent-lamiraux in #256
• Fix C++98 compatibility by @jcarpent in #258

Full Changelog: v1.7.8...v1.8.0