C++: Fix highlighting for lines with predefined macros

This adds definitions for the macros __FILE__, __LINE__, __DATE__ and
__TIME__ on demand.

As a side effect, this also introduces highlighting for the uses of
these macros.

Task-number: QTCREATORBUG-8036
Change-Id: Ib7546c7d45d2eecbc50c7883fc684e3497154405
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>