Decouple Flashcard Game from deck selection

[saschlac]

The idea is to have one page to select the game you want to play and another page to actually play the game. So the selection page would have links to the game page (for example: play.php?ID=10) . Then the game page could pull the gameID from the URL and load the game data from the server as it is done currently. There are a couple of reasons we might want to do this:

• Modularity/Maintenance: If we need to switch the way we the user selects games we can. We can put the game into production with one version of the game selection page then if/when we needs to develop a new one we can just swap out a page rather than merging code. Along with that, one thing I noticed as I was building the QuestionSetEditor was that as the number of games increased it became more of a pain to select games at the end, so we do need to start thinking about a different way to organize that information.
• Direct linking: Users may want to link their friends (or students) directly to a set of questions. I know you could just implement things in JS to support direct linking, but by splitting the two screens into two pages there's no need to develop and support direct linking in JS.

[saschlac]

I think the primary benefit to having a separate page for game selection is that we can eventually swap out the game selection screen as mentioned in issue #10. Even now with only 16 test question sets it's difficult to even know that there are 16 question sets when you first land on http://exscitech.org/flashcards/ . By modularizing the application we can develop the two independently.

[CMahaff]

Actually it is already modularized by our framework - the JS and CSS for that 'screen' are separate from the main game JS and CSS. Changing both at once would not cause conflicts.

Again, I'd like to avoid mixing PHP and HTML where possible, and using JS to call the correct PHP functions (based on the URL parameters), as we have with other requests, would let us do that and keep us from having to redo the page from scratch.