Using Refu in eWASM to write Ethereum contracts

[axic]

With #34 in place it seems to be possible emitting WebAssembly from Refu.

In order to write contracts, the following is needed:

1. A bignumber library, perhaps optimised for 256 bit numbers.
2. A standard library specifying the foreign_imports for all the Ethereum interface methods.
3. A framework providing high level Ethereum features (built on top of 1. and 2.)

[LefterisJP]

Implementing Ethereum contracts in Refu would be a really nice feature as we discussed offline.

Regarding (1) I believe the natural choice for C and big numbers would be GMP. Are you aware of any other big number libraries?

[pferdy]

Convex has developed big integer arithmetic >64 bits.