CB-6440 Move signing-utils out of bin

- No longer used by check_reqs script
- Unit tests no longer need to copy signing-utils.js
CB-6440 Remove check_reqs.js

Node dependency is covered by package.json engines
CB-6440 Move create.js to lib
CB-6440 create - use shelljs rather than custom copy function
CB-6440 Remove +x from .bat files
CB-6440 Move utils.js from bin to template