Refactor accounts.json and deployments.txt files

[ericnordelo]

Currently, the project is creating these files when setting up accounts or deploying contracts: [network].accounts.json and [network].deployments.txt

Room for improvement:

• Format inconsistency (json and txt).
• Structure inconsistency.
• Merging hex and integers (public_key as int, and address as hex).
• Multiple files at the project's root directory (one account and one deployment for each network). Maybe having a folder for deployments would be helpful?
• nile init creating an account.json file that is never used (not having the network)

[ericnordelo]

This issue can be extended to have a proper deployment system to be able to define and re-execute flows, but that is certainly bigger and can be implemented with plugins.

[martriay]

big plus one to all those issues. i was convinced we had an issue tracking the multiple files, format, and structure problems but could not find it.