* Refactor Counter to support increment and decrement.
* Move Counter out of drafts.
* Refactor ERC721 to use Counter.
* Rollback Counter returning the current value in increment and decrement.
* Update test/drafts/Counter.test.js
Co-Authored-By: nventuro <nicolas.venturo@gmail.com>
* Improve Counter documentation.
* Move Counter.test to utils.
* Move back Counter to drafts.