Scape state write

What does this MR do?

• if ini file has no [writer] section, don't write vtk output files
• Adds a BitFlags that helps to manipulate enumerators

Can this MR be accepted?

• Implemented
• Added/Updated tests:
  • Run dune_copasi with an ini file with no [writer] section
• Added/Updated documentation
• Pipelines passing
  • [ ] (Pipeline is broken, see #25 for details)
  • 
  • 
• Delete branch option set
• Added entry to CHANGELOG.md

Related issues

Closes #