Feature/#479 fix cppcheck clang conan

Update to newer cppcheck version and get it from the actual repo.

+some fixes necessary to make cppcheck happy

merged

By Fabian Lennartz on 2018-06-29T13:24:56 (imported from GitLab)

mentioned in commit be0ccc99

By Fabian Lennartz on 2018-06-29T13:24:56 (imported from GitLab)