D13014: Update Clang Tidy script to Clang 6.0 and fix some findings

[Csaba Kertész]

ckertesz closed this revision.

REPOSITORY
  R321 KStars

REVISION DETAIL
  https://phabricator.kde.org/D13014

To: ckertesz, mutlaqja
Cc: kde-edu, narvaez, apol
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