Allow function pointers#3
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This necessitates plumbing through a callback function, so that SDL can be called. So as to not repeat ourselves, extract the code that was used around update() calls, FPS handling, etc, and have a shared function. While around, reshuffle some initialisation to be earlier, and make it so there's not a 1/FPS gap before drawing a frame, but a 1/FPS gap _between_ frames (assuming non-zero time to calculate the next frame etc).
This is needed for e.g. Picopolis, which replaces _update() at different stages of the game.
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Builds on #2
This is enough to get Picopolis to start up and work (at least for a few seconds of play, haven't done extensive testing).