Static fields were broken up from instance fields and demoted to
Stage 2 in the November 2017 TC39 meeting. This patch removes the
test262 tests which test static class fields.

- 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