Update the developer documentation.

It's got a bit out of date over the years, with some changes to the
code not fully reflected in it (e.g. not all the int -> bool type
changes were documented, and TRUE and FALSE were still mentioned),
and quite a lot of new functions not added. (In particular, the dsf
API was not documented, and it certainly should have been, if only so
that people can find out what it even stands for!)

As well as correcting for factual accuracy, two content changes in the
advice chapter:

I've reworded the definition of 'fairness' to explicitly mention that
requiring the player to use Undo is cheating. That's always how I
_intended_ the definition, but I didn't say it clearly enough.

And I've added an entire new section describing the normal sensible
way to implement redraw(), via a loop of the form 'work out what this
cell should look like, check it against an array in game_drawstate of
the last state we drew it in, and if they're different, call a redraw
function'. That was mentioned in passing in two other sections, but I
know at least one developer didn't find it, so now it's less well
hidden.

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