JSHint: Re-order jshintrc options to split common from project settings

There are certain options required by our coding conventions.
The others are specifically overriding it for core. Either
because we have certain code that needs laxing or because we
can be stricter.

Comments can be used in jshintrc since a while now. Though
they are invalid JSON, many parsers (including JSHint) allow
them for documentation purposes.

Change-Id: I43ace21208121e866900b2cbe1efbcebadd2946a
Merge "JSHint: Re-order jshintrc options to split common from project settings"