Frank Denis 7674a8b43d p256: update to the last fiat-crypto code & share PC tables
fiat-crypto now generates proper types, so take advantage of that.

Add mixed subtraction and double base multiplication.

We will eventually leverage mixed addition/subtraction for fixed
base multiplication. The reason we don't right now is that
precomputing the tables at comptime would take forever.
We don't use combs for the same reason. Stage2 + less function
calls in the fiat-crypto generated code will eventually address
that.

Also make the edwards25519 code consistent with these changes.

No functional changes.
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