* Make CI fail with readability-container-size-empty flag
* Make CI fail with cppcoreguidelines-owning-memory flag
* Add all google checks, exclude specific ones
* Apply clang-tidy fixes
* Make timer constructors explicit
* Add check for unscoped namespaces
* Replace unscoped namespace by using-declaration
* Replace unscoped namespace by using-declaration
* add an example where the name of the enum is printed through a stream output function, which subverted the checkTransformer conversion and prevented conversion of the enumeration.
* add missing 'typename'
* try a simpler version of the value_string using const reference for all overloads
* use auto return type to match to_string return type in value_string
* remove extra spaces
