Execution: Support precompile 0x1 (ecrecover)

[wjmelements]

We want to support the precompile ecdsarecover aka ecrecover at 0x1

[wjmelements]

Considering https://github.com/ilia3101/Big-Integer-C to support the ECC math. It needs testing but seems to work.

[wjmelements]

Good license too

[wjmelements]

I want to be able to refer to precompiles by name in the assembler, like

STATICCALL(GAS, ECDSARECOVER, 0, 128, 0, 32)

[wjmelements]

Considering https://github.com/ilia3101/Big-Integer-C to support the ECC math. It needs testing but seems to work.

Also considering https://github.com/bitcoin-core/secp256k1