This mainly enforces the rules as descripted in ES 3.10, section
2.2.1 and 2.2.2, by enhancing the "queryconversions" to support
more rules, removing the scattered type convertors in "utilities"
, "mathutil" and "queryutils", and forcing to only use the
convertors in "queryconversions".

BUG=angleproject:2165

Change-Id: I73c1dc850e2b3b8a479ece1d9c5eb7ae4ce851fe
Reviewed-on: https://chromium-review.googlesource.com/680094
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>