Add serialization of Roadmap, Device, WeighedDistance and related classes

CMakeLists.txt

include/hpp/manipulation/device.hh

include/hpp/manipulation/leaf-connected-comp.hh

include/hpp/manipulation/roadmap-node.hh

include/hpp/manipulation/roadmap.hh

include/hpp/manipulation/serialization.hh

include/hpp/manipulation/weighed-distance.hh

src/constraint-set.cc

src/device.cc

src/serialization.cc

src/weighed-distance.cc