Update upstream parity

[s1na]

This PR updates the parity-ethereum to v2.3.3, and fixes the breaking api changes that have happened. Build doesn't fail anymore, but I didn't know how to test it!

[s1na]

Updated the build script to use chisel instead of wasm-gc, and replaced stat -f%z with wc -c which is more portable (stat didn't work for me).

I was also able to instantiate the module from js.

[axic]

It seems upstream is so unstable that now it doesn't compile anymore:

    Updating git repository `https://github.com/ewasm/ewasm-rust-api`                                                                                                    
    Updating git repository `https://github.com/paritytech/parity-common`                                                                                                
error: no matching package named `patricia-trie` found                                                                                                                   
location searched: https://github.com/paritytech/parity-common
required by package `vm v0.1.0 (/Users/alex/Projects/runevm/parity-ethereum/ethcore/vm)`
    ... which is depended on by `runevm v0.1.0 (/Users/alex/Projects/runevm)`

[s1na]

I did a fresh clone to test and it seems to work. Is your submodule on openethereum/parity-ethereum@3b9b1a8?

[axic]

My bad, it did work on another fresh install.