class-fields-public doesn't apply to all tests that are generated from these templates

- Add tests for multiple public fields of the same name
- Reorganize fields default templates
- Add more tests for redeclaration of fields
- Remove non used template
- Add tests for computed property names in class fields definitions
- Minor test fixes

Thanks @andresaraujo for helping with the early review

* Accessing `ta[0]` throws a TypeError.

* Fix array indices starting at 0 and property references

* Fix classfields templates for properly checking static propnames.

* Generate tests

* `assert.equal` is not defined

* Add missing includes

* Generate tests

* typo s/Avalue/42/

* fix whitespace

* Add missing var for strict mode

* Expand generated class fields tests for forbidden computed property name values

Ref https://github.com/tc39/test262/pull/1339#issuecomment-342830243

* derived classes have access to private names in base classes, if private names are in scope

- Correct property access in class fields template
- Remove assertions for properties which aren't present
- Correct expected assertion value for uninitialized class field
- Correct expected property descriptor attributes
- Fix property tests in class-fields/string-literal-names.case
- Pass restore option, otherwise it's not possible to call the method later
- Fix async iteration tests to test iteration result objects

This reverts commit e731114c.

At this point this requires Babel for testing, but most tests in this
commit won't pass until this is fixed:
https://github.com/babel/babel/issues/5056