Switch to pybind11 for dartpy

[jslee02]

hello_world.py:

import dartpy as dart


def main():
    world = dart.simulation.World.create()

    urdfParser = dart.utils.DartLoader()
    kr5 = urdfParser.parseSkeleton("dart://sample/urdf/KR5/KR5 sixx R650.urdf")
    ground = urdfParser.parseSkeleton("dart://sample/urdf/KR5/ground.urdf")
    world.addSkeleton(kr5)
    world.addSkeleton(ground)

    node = dart.gui.osg.RealTimeWorldNode(world)

    viewer = dart.gui.osg.Viewer()
    viewer.addWorldNode(node)
    viewer.setUpViewInWindow(0, 0, 640, 480)
    viewer.run()


if __name__ == "__main__":
    main()

Screenshot:

---

Before creating a pull request

• Document new methods and classes
• Format new code files using clang-format

Before merging a pull request

• Set version target by selecting a milestone on the right side
• Summarize this change in CHANGELOG.md
• Add unit test(s) for this change

[codecov]

Codecov Report

Merging #1307 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1307   +/-   ##
=======================================
  Coverage   57.11%   57.11%           
=======================================
  Files         363      363           
  Lines       26954    26954           
=======================================
  Hits        15395    15395           
  Misses      11559    11559