John Beard 215533f31a Unify flip direction handling
There was a gentle mish-mash of booleans, some with
true being left/right and some up/down, and some functions that
can flip in both axes (which is never actually done, and doesn't
really make geometric sense).

Replace all this with the FLIP_DIRECTION enum class, which makes
the intention completely unambiguous.

This also then allows a small scattering of simplifications,
because everything takes the same type and you don't have to
fiddle booleans to fit.
2024-09-27 17:13:13 +01:00
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