Add bool Definition::isWordWrapDelimiter(QChar)

Summary:
Checking word wrap delimiters is used by some langauge to
make sure static word wrap does not create invalid syntax,
for instance in LaTeX.

Test Plan: make && make test

Reviewers: vkrause, cullmann

Reviewed By: cullmann

Subscribers: kwrite-devel, kde-frameworks-devel

Tags: Kate, Frameworks

Differential Revision: https://phabricator.kde.org/D14759