* ✏️ Refactor code & Refork OZ Repo * Refactor ERC20Snapshot to use on-demand snapshots. * Add ERC20Snapshot changelog entry. * Move ERC20Snapshot to drafts. * Improve changelog entry. * Make snapshot tests clearer. * Refactor ERC20Snapshots to use Counters. * Refactor snapshot arrays into a struct. * Remove .DS_Store files. * Delete yarn.lock * Fix linter error. * simplify gitignore entry