graphics/libopendrive: Add libopendrive 0.5.0

libOpenDRIVE is a lightweight, dependency-free, fast C++ library providing
OpenDRIVE file parsing and 3D model generation.

It's small and can be easily integrated in other projects. A core function is
the parsing of OpenDRIVE files and the generation of 3D models. The library
targets OpenDRIVE version 1.4.