Support structs, enums and tuples in sha3() and other "accept arbitrary parameters" functions

[axic]

• support structs
• support enums
• support tuples
• support contracts (encoded as addresses)
• disallow anything else as part of the type checker

contract test {

    struct TestStruct {
        uint a;
    }

    function test() {
        TestStruct memory testing = TestStruct({a: 1});
        sha3(testing);
    }
}

(Follow up from #332)

[chriseth]

This is most likely a duplicate of #595

[pirapira]

I added "tuples" in the description because the title says "tuples".

[chriseth]

Since we only support bytes memory in those functions in the future, and everything else has to use abi.encode, this can be closed.

[krzkaczor]

If anyone is still wondering how to do this, use abi.encodePacked:

keccak256(abi.encodePacked(struct.a, struct.b, struct.c));