Refactor handling of 'general approach ' / 'restricted approach' for graph game BDD

[annyanich]

The nice way to implement this feature (with the buttons inside the tab on the right-hand panel) would have been to just open the tab fully client-side and not send any request to the server until the user pressed the button to choose between the two approaches.

Unfortunately, I implemented the tabs assuming that one tab <-> one Job object on the server.
I wrote the client in Javascript and not Typescript, and as a result, it is kind of hard to understand it and refactor it to allow tabs that are not jobs while feeling confident that the refactoring will be a success.

As a result of that, and because we are on a deadline, I have instead implemented this feature in a slightly hacky way to avoid performing that tricky refactoring.

The places that need to be rewritten include basically everything I added in the branch for #82. I will also put TODOs in some specific spots that may not be so obvious.

[mgieseking]

I improved a little bit the display of this, but now I really like it and don't see all your hacking. Perfect ;).