Features: add missing "destructuring-binding" features; remove "default-arg" (#1521)

features.txt

.../binding/initialization-requires-object-coercible-null.js

...ing/initialization-requires-object-coercible-undefined.js

...ialization-returns-normal-completion-for-empty-objects.js

...cturing/binding/syntax/array-elements-with-initializer.js

...ing/binding/syntax/array-elements-with-object-patterns.js

...ring/binding/syntax/array-elements-without-initializer.js

...structuring/binding/syntax/array-pattern-with-elisions.js

...ucturing/binding/syntax/array-pattern-with-no-elements.js

...guage/destructuring/binding/syntax/array-rest-elements.js

...ng/binding/syntax/object-pattern-with-no-property-list.js

...cturing/binding/syntax/property-list-bindings-elements.js

...inding/syntax/property-list-followed-by-a-single-comma.js

...ring/binding/syntax/property-list-single-name-bindings.js

...turing/binding/syntax/property-list-with-property-list.js

...ing/binding/syntax/recursive-array-and-object-patterns.js

...ns/object/method-definition/generator-super-prop-param.js