Better lowmemory feature with precomputed ECMULT #299
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Based on @justinmoon's no_std branch
Reduces the memory cost of a secp context from about 64KB to 704 bytes, while increasing the code section size by 62KB.
Also greatly reduces stack utilization while setting up the context. Previously, about 200KB were being used during context generation, and now we can fit in less than 64KB RAM.