nx2: replay repeated native macro calls instead of interpreting them

Title 1 makes ~1,000,000 native macro calls a second in 3D scenes, 7
instructions each on average, and 96% repeat an earlier call exactly.
A call whose effects depend only on its start, its parameters and the
data RAM words it read (no MME_READ, no memory reads, no re-read of
its own data RAM writes, no code upload while it ran) is remembered
with those reads as guards; a later call with the same start and
parameters whose guards still hold replays its data RAM and method
writes. Uploading macro code clears the memo. EDEN_NX2_MME_MEMO=0
interprets every call.

Checked offline against the previous interpreter on 200,000 recorded
3D-scene calls (method writes, registers and data RAM all identical,
94% replayed, 1.9x faster); in the game the macro zone fell from ~0.26
to ~0.20 us per call.

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