CppTools: Make use of QLoggingCategory

...for document processing and highlighting.

Change-Id: I31d42a5a5010260643ec76688080fd14a486f7e3
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>
ClangCodeModel: Make use of QLoggingCategory

Change-Id: I28d50e224803096c032ae6e387bf1346db4cc216
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>
TreeViewComboBox: Fix home and end keys in presence of unselectable items

Change-Id: I33ba7677571c4b813c9dc7779f61ad7287826733
Task-number: QTCREATORBUG-13314
Reviewed-by: Daniel Teske <daniel.teske@digia.com>