Add a way to pass the `evmVersion` parameter
to `solc` by:

1. Simplify the `Compiler.compileJSON()` interface from
`compileJSON(source, optimize)` to `compileJSON(source)`

Whether optimization is enabled is then always determined by
the `Compiler.optimize` object field which simplifies data flow.

2. Add a `Compiler.evmVersion` field and a setter and
make `compileJSON()` honor that.

Specifying `evmVersion` is useful when targetting an older
private chain with the latest `solc` or when using
an EVM-compatible chain that's slightly behind Ethereum
main-net in terms of features.

The unused `userAgent` variable in `onInternalCompilerLoaded` was
only removed to fix `npm run test` for `remix-solidity`'.

publish lerna

Various Fix on Debugger

add more methods to remix-sim; fix accounts

Update README.md

Bump version

move to ethers v4

Remove duplicated function declaration 'Ethdebugger.prototype.debug'

remix-debug depends on web3

remix-debug has the following line in `src/cmdline/index.js`:
```
var Web3 = require('web3')

<... snip ...>

  connect (providerType, url) {
    if (providerType !== 'http') throw new Error('unsupported provider type')
    this.web3 = new Web3(new Web3.providers.HttpProvider(url))
  }

```

So it should either mark `web3` as a dependency in `package.json` or
refactor `remix-lib` to provide a web3 provider that can take an
`url` paramter.

This patch does the former and makes `remix-debug` depend on the same
version of `web3` as `remix-lib` in `package.json`.

Update universalDapp.js (fix bad reference)

add görli test net declaration (contract metadata)

fix for electron w/dynamic loading of solcjson

This is a fix so that remix will work inside of electron, and presumably, it makes sense for dynamic downloading of solidity compiler. When I enable node integration with electron and install solc node module, it looks like it works for a second, but then it too does not work (page goes blank).

I'm not sure if require() works here with node, as I believe solcjson would need to be downloaded into a path that can be resolved by require (typically node_modules). Notably, electron docs recommend against enabling node integration when remote scripts are loaded dynamically.