Clean up edit.module to match coding standards

Lots of small coding standards changes like:

1. Add missing @file docblocks.
2. Update/correct the closures in JS files to reflect the actual dependencies of the JS in that file.
3. Removed the last reference to Create.js.
4. Apply {@inheritdoc} where it's not yet being used.
5. s/function/public function/ where that is not yet set
6. Remove the @todo in MockEditEntityFieldAccessCheck.php to remove that mocked class when a certain issue has landed, because until tests are converted to use PHPUnit rather than DrupalUnitTestBase, we will continue to need that mocked class, since we can't simulate request data in DUTB.

In other words: fix lots of small nitpicks that have been accumulated over time.