Added more tests for class and super.

class now tests for block-scoping. super's original test is now divided into 3 subtests.
Added implicit strict mode subtest for class.
Added "this" unchanged by call or apply' subtest to arrows
Added Map/Set/WeakMap/WeakSet subtests.

These results are preliminary and have not yet been confirmed.
Updated Map/Set subtest results.

This also puts Map#size and Set#size into separate subtests.
Tweaked some class results due to lack of information.

I can't actually test EJS or Closure, so I'm tentatively marking them No until someone else can vouch for them.
Merge pull request #301 from webbedspace/yet-more-hurdles-for-belaboured-browser-vendors-to-leap

More subtests