Release v4.5.0

Changes since v4.4.0:

• Generate servant directly from IDLs
• fix build in c++11
• Object oriented IDL
• remove python symlinks & omniidl superfluous files, add test, setup CI
• Update to pinocchio v2 + misc
• Fix deprecated operator<== with int, to allow c++11 compat
• Allow inheritance of Python classes ProblemSolver and Robot
• fix tests, add .gitlab-ci.yml & badges
• Update IDL related to constraints.
• Add idl interface to add and clear config validations
• Change short in long in idl and C++ code.
• Add some IDL bindings
• update readme : add troubleshooting section
• Add a idl method to get the velocity along a path.
• add python binding in order to choose distance type
• Parameter map