D16982: Switch to tidy-html5 and use tidybuffio.h instead of buffio.h

[Andreas Sturmlechner]

asturmlechner created this revision.
asturmlechner added a reviewer: Konqueror.
asturmlechner requested review of this revision.

REVISION SUMMARY
Header was renamed a few years ago.

TEST PLAN
Builds and validates fine.

REPOSITORY
R226 Konqueror

BRANCH
master

REVISION DETAIL
https://phabricator.kde.org/D16982

AFFECTED FILES
plugins/validators/CMakeLists.txt
plugins/validators/tidy_validator.cpp

To: asturmlechner, #konqueror