* chore: update to Embark v5
* fix: fix tests for Embark 5
* update Embark version and remove Geth client
* change contracts to deploy and add cross-env for Windows support
* feat: upgrade to Embark 5.1.nightly2
Fixes the problem of not exiting on build end
* update to Embark 5.1
Fixes issue where artifacts are not built