System include paths are appended after other includes by the compiler. So
we should set them as system includes and not as normal includes. Otherwise
we change the include order. Headers in system include paths are not
cluttering the screen with unwanted warning and by the way improve
performance too.
ProjectPartHeaderPath was a dopperganger of HeaderPath, so we merged them.
Change-Id: I7c394b4098b697de79761499ffcd5913cc02d652
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>
Also extracting inline HeaderPath class and change projects list in vector
because the size is larger than a pointer.
Change-Id: I885fdff3fe9bccc877634d1615249755f5b674fd
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>
