Reverted "Made Query.setMandatory() as public".
See comment https://github.com/restx/restx/pull/33#commitcomment-3942646.
This reverts commit a1bbc07d8435b4915375523d5025abf7e7bb5d6f and updates commit 375406e42c4436085b878ab0770d57cd69d35fdc
Moved MoreStrings.headerTokenCompatible() to HTTP.headerTokenCompatible()