COMP: Correct errors in TimeIntegrator

1) include <g3log/g3log.hpp> for logger
2) use TimeIntegrator::Type instead of timeIntegratorType
3) use std::array to be able to assign from an initializer list

Style:
1) Add call definition in error logs
2) Change case of TimeIntegrator::Type enum
3) do not use 'this->' on class members