Add cppcheck & clang-tidy to CI

[markos]

Add cppcheck and clang-tidy for each file in the build for static code analysis.

[markos]

cppcheck added: https://buildbot-ci.vectorcamp.gr/#/builders/269/builds/2/steps/5/logs/stdio

[markos]

clang-tidy added: https://buildbot-ci.vectorcamp.gr/#/builders/282/builds/2