cpplint for TravisCI builds

[alexeevdv]

We are going to use https://github.com/cpplint/cpplint in order to make code compatible with http://google.github.io/styleguide/cppguide.html

[phobos2077]

Strange decision. Google's style guide is very controversial :)

[alexeevdv]

There is need for some code style. And Google's one not the worst

[phobos2077]

I thought we already had code style. What's the point reformatting all code for it? It's even documented in the wiki. Why not configure cpplint for existing rules?

[JanSimek]

Should be a piece of cake with this Github Action: https://github.com/marketplace/actions/action-cpp-lint

Alternatively, we could use a .editorconfig action since we already have .editorconfig

[eirnym]

As this project started to use clang-format (based on configuration files for it), I'd suggest to add format and tidy GitHub Workflows for this. Few of them I found:

https://github.com/marketplace/actions/clang-format-check
https://github.com/marketplace/actions/clang-format-lint
https://github.com/marketplace/actions/c-code-linter-clang-tidy-and-cppcheck

[alexeevdv]

clang-tidy has been added to workflow in #657
clang-format will be added as soon as .clang-format config become stable