fix generateGenesis setting toBalance, don't overwrite codeHash and stateRoot, tidy

fix chalk output, update chalk to latest, tidy file and add typedocs

attempt to resolve peer:error event handler memory leak by removing bound listener after disconnect, tidy

fix new webpack polyfill errors from node-fetch, which we don't use so can safely pass false

nit: more stateManager generateGenesis code tidying

update multiaddrs to latest to fix libp2p so it doesn't bring node-fetch into webpack/karma