If instead of intaking calls, we intake code, we can deploy a fresh contract
which makes arbitrary calls *without* attempting to build our abstraction
layer over the concept.
This should have the same gas costs, as we still have one contract deployment.
The new contract only has a constructor, so it should have no actual code and
beat the Sandbox in that regard? We do have to call into ourselves to meter the
gas, yet we already had to call into the deployed Sandbox to achieve that.
Also re-defines the OutInstruction to include tokens, implements
OutInstruction-specified gas amounts, bumps the Solidity version, and other
such misc changes.
* Rename the coins folder to networks
Ethereum isn't a coin. It's a network.
Resolves#357.
* More renames of coins -> networks in orchestration
* Correct paths in tests/
* cargo fmt
