Implement 'collect_all_game_states'

[richelbilderbeek]

Is your feature request related to a problem? Please describe.

Currently, there is no way to collect all game_states. This is useful in debugging, so it must be added.

Describe the solution you'd like

• [x] Implement collect_all_game_states. Search for collect_all_ to peek how to do so

• [x] Activate this test and make it pass:

  //#define FIX_ISSUE_578
  #ifdef FIX_ISSUE_578
  //Can collect all game states
  {
    const std::vector<game_state> v = collect_all_game_states();
    assert(v.empty());
  }
  #endif //FIX_ISSUE_578

Activate it by removing the comments from //#define FIX_ISSUE_578

• [x] Remove the # lines

Done!

Describe alternatives you've considered

None.

Additional context

None.

[richelbilderbeek]

Someone needs to do the last the items of the Issue. Good luck :+1:

[AramPetiet]

Done! :100: