CppEditor: Do not "highlight parentheses" for multiline C++ comments

Change-Id: I6c84a2653a1e9c13e1c776b49b4e51cb4de772f3
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>
Qbs: Fix reparsing after building

Change-Id: Ic06718ddc6813fbe02078976e4bc571fb382d96a
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>