Testing identified performance issues related to reading restart file name from summary files.
Make sure the reading of timesteps is done only when required in new function getFileInfoAndTimeSteps.
Add reading of restart file name using opm-common when opm-common is active. The performance of this reader is much better than resdata.
* Use one common variable for object name, use three ints
* Move enums to separate file
* Refactor use of enums
* Move implementation to cpp
* Refactor includes
* #8425 Multi Graph : Support grouping on object name
* #8425 Multi Graph : Improve creation of new graphs
* #8425 Multi Graph : Improve default tick mark count
* Handle history and non history as identical headers
* #8425 Multi Graph : Increase space below a graph