D6870: add missing standard types to C highlighting and update to C11

[Sven Brauch]

brauch added reviewers: vkrause, dhaumann.

REPOSITORY
  R216 Syntax Highlighting

REVISION DETAIL
  https://phabricator.kde.org/D6870

To: brauch, vkrause, dhaumann
Cc: vkrause, dhaumann, #frameworks