Self update in thcrap_configure

[brliron]

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For now, the self update (update to thcrap itself) only run in thcrap_loader. It would be nice if we could also self-update in thcrap_configure, so that users have the last version of thcrap_configure with potentially needed bugfixes.

It also makes more sense with new games - the easiest way to add a new game for now is:

• Take your current, outdated version of thcrap which doesn't support the new game.
• Add the new game with your version of thcrap which doesn't support the new game.
• Run the new game with your version of thcrap which still doesn't support the new game.
• Thcrap updates itself and now supports the new game.

It doesn't make much sense to users that steps 2 and 3 would work (even though it does), so I tend to recommend to run any game in order to self-update before doing the 1st step. Telling them to run the configuration tool and wait for it to update would make more sense.