D19432: [text thumbnailer] Use KSyntaxHighlighting for text rendering

[Friedrich W. H. Kossebau]

kossebau added a reviewer: cfeck.

REPOSITORY
  R320 KIO Extras

REVISION DETAIL
  https://phabricator.kde.org/D19432

To: kossebau, broulik, cfeck
Cc: vkrause, cfeck, kde-frameworks-devel, kfm-devel, alexde, feverfew, 
michaelh, spoorun, navarromorales, firef, ngraham, andrebarros, bruns, 
emmanuelp, mikesomov